DP Physics Questionbank

Description

Overview of essential ideas for this topic.

11.1: The majority of electricity generated throughout the world is generated by machines that were designed to operate using the principles of electromagnetic induction.

11.2: Generation and transmission of alternating current (ac) electricity has transformed the world.

11.3: Capacitors can be used to store electrical energy for later use.

Directly related questions

• 18M.2.HL.TZ2.8d: State one assumption that needs to be made so that the Earth-thundercloud system may be modelled...
• 18M.2.HL.TZ2.8c.i: Show that about –11 C of charge is delivered to the Earth’s surface.
• 18M.2.HL.TZ2.8b.ii: Calculate in J, the energy stored in the system.
• 18M.2.HL.TZ2.8b.i: Calculate in V, the potential difference between the thundercloud and the Earth’s surface.
• 18M.2.HL.TZ2.8a: Show that the capacitance of this arrangement is C = 6.6 × 10–7 F.
• 18M.1.HL.TZ2.36: Three capacitors, each one with a capacitance C, are connected such that their...
• 18M.1.HL.TZ2.35: The graph shows the power dissipated in a resistor of 100 Ω when connected to an alternating...
• 18M.1.HL.TZ2.34: A rectangular flat coil moves at constant speed through a uniform magnetic field. The direction...
• 18M.1.HL.TZ2.33: The current I flowing in loop A in a clockwise direction is increasing so as to induce a...
• 18M.2.HL.TZ1.7e: Describe the use of transformers in electrical power distribution.
• 18M.2.HL.TZ1.7d: In a different circuit, a transformer is connected to an alternating current (ac) supply. The...
• 18M.2.HL.TZ1.7c: The capacitor is fully charged and the space between the plates is then filled with a dielectric...
• 18M.2.HL.TZ1.7b: The capacitor is connected to a 16 V cell as shown.                                          ...
• 18M.2.HL.TZ1.7a: Calculate the distance between the plates.
• 18M.1.HL.TZ1.36: A parallel plate capacitor is connected to a cell of negligible internal resistance.            ...
• 18M.1.HL.TZ1.35: The diagram shows a diode bridge rectification circuit and a load resistor.                    ...
• 18M.1.HL.TZ1.34: The graph shows the variation with time t of the current I in the primary coil of an ideal...
• 18M.1.HL.TZ1.33: Two identical circular coils are placed one below the other so that their planes are both...
• 17N.2.HL.TZ0.2e: The magnetic field strength of the Earth is 31 μT at the orbital radius of the satellites. The...
• 17N.2.HL.TZ0.2c: The cable between the satellites cuts the magnetic field lines of the Earth at right...
• 17N.1.HL.TZ0.38: A capacitor of capacitance C discharges through a resistor of resistance R. The graph shows...
• 17N.1.HL.TZ0.37: Six identical capacitors, each of value C, are connected as shown. What is the total...
• 17N.1.HL.TZ0.36: An alternating current (ac) generator produces a peak emf E0 and periodic time T. What are...
• 17N.1.HL.TZ0.35: The ratio \(\frac{{{\text{number of primary turns}}}}{{{\text{number of secondary turns}}}}\) for...
• 17N.1.HL.TZ0.34: The plane of a coil is positioned at right angles to a magnetic field of flux density B. The...
• 259334: This is an example question for the example test. You can delete this question.
• 16M.1.HL.TZ0.35: Which of the following...
• 10N.2.HL.TZ0.A4c: Explain how readings on the high resistance ac voltmeter can be used to compare the rms values of...
• 10N.2.HL.TZ0.A4b: The graph below shows the variation with time \(t\) of the current in the cable. On the axes...
• 10N.2.HL.TZ0.A4a: In order to measure the rms value of an alternating current in a cable, a small coil of wire is...
• 09N.1.HL.TZ0.26: Raoul suggests that power losses in a transformer may be reduced by the following. I.   ...
• 09N.1.HL.TZ0.25: A magnetic field of strength \(B\) links a coil. The direction of the field is normal to the...
• 10M.1.HL.TZ1.34: The capacitance of a pixel of a CCD is 3.2 pF. A pulse of light is incident on the pixel and as a...
• 10M.1.HL.TZ1.26: An alternating current supply of negligible internal resistance is connected to two resistors...
• 10M.1.HL.TZ1.25: A copper sheet is suspended in a region of uniform magnetic field by an insulating wire connected...
• 17M.2.HL.TZ2.6e.ii: The use of alternating current (ac) in a transformer gives rise to energy losses. State how eddy...
• 17M.2.HL.TZ2.6e.i: Suggest the advantage of using a step-up transformer in this way.
• 17M.2.HL.TZ2.6c: Calculate the root mean square (rms) current in each cable.
• 17M.2.HL.TZ2.3b: The resistance of the wire is 8.0 Ω. Determine the time taken for the capacitor to discharge...
• 17M.2.HL.TZ2.3a: The capacitance of the capacitor is 22 mF. Calculate the energy stored in the capacitor when it...
• 17M.2.HL.TZ1.8d: Step-up transformers are used in power stations to increase the voltage at which the electricity...
• 17M.2.HL.TZ1.8c: Outline how energy losses are reduced in the core of a practical transformer.
• 17M.2.HL.TZ1.8b.ii: The input voltage is 240 V. Calculate the output voltage.
• 17M.2.HL.TZ1.8b.i: Explain, using Faraday’s law of induction, how the transformer steps down the voltage.
• 17M.2.HL.TZ1.8a: State Faraday’s law of induction.
• 17M.1.HL.TZ2.36: A fully charged capacitor is connected to a resistor. When the switch is closed the capacitor...
• 17M.1.HL.TZ2.35: Two capacitors of different capacitance are connected in series to a source of emf of...
• 17M.1.HL.TZ2.34: Three conducting loops, X, Y and Z, are moving with the same speed from a region of zero magnetic...
• 17M.1.HL.TZ2.33: The diagram shows a bar magnet near an aluminium ring. The ring is supported so that it is...
• 17M.1.HL.TZ1.36: A conducting square coil is placed in a region where there is a uniform magnetic field. The...
• 17M.1.HL.TZ1.35: A capacitor is charged by a constant current of 2.5 μA for 100 s. As a result the potential...
• 17M.1.HL.TZ1.34: A battery is used to charge a capacitor fully through a resistor of resistance R. The energy...
• 17M.1.HL.TZ1.33: What are the units of magnetic flux and magnetic field strength?
• 17M.1.HL.TZ1.32: A direct current (dc) of 5A dissipates a power P in a resistor. Which peak value of the...
• 16M.2.HL.TZ0.7d: (i) The permittivity of the dielectric material in (c) is twice that of a vacuum. Calculate the...
• 16M.2.HL.TZ0.7c: A dielectric material is now inserted between the plates of the fully charged capacitor. State...
• 16M.2.HL.TZ0.7b: (i) The time constant of this circuit is 22s. State what is meant by the time constant. (ii)...
• 16M.2.HL.TZ0.7a: On the axes, draw a graph to show the variation with time of the voltage across the resistor.
• 16M.2.HL.TZ0.6b: The diagram shows charge carriers moving with speed v in a metallic conductor of width L. The...
• 16N.2.HL.TZ0.10c: In an alternating current (ac) generator, a square coil ABCD rotates in a magnetic field. The...
• 16N.2.HL.TZ0.10b: Electrical power output is produced by several alternating current (ac) generators which use...
• 16N.1.HL.TZ0.36: Three capacitors are arranged as shown. What is the total capacitance of the arrangement? A....
• 16N.1.HL.TZ0.35: A parallel-plate capacitor is connected to a battery. What happens when a sheet of dielectric...
• 16N.1.HL.TZ0.34: The secondary coil of an alternating current (ac) transformer is connected to two diodes as...
• 16N.1.HL.TZ0.33: Which of the following reduces the energy losses in a transformer?  A. Using thinner wires for...
• 16M.1.HL.TZ0.34: Three identical capacitors, each of...
• 16M.1.HL.TZ0.33: A parallel-plate capacitor is...
• 16M.1.HL.TZ0.32: A full-wave diode rectification circuit is...
• 16M.1.HL.TZ0.31: An alternating current (ac) power supply...
• 16M.1.HL.TZ0.30: The diagram shows a conducting rod of length L being...
• 16M.1.HL.TZ0.29: A coil of area A is placed in a region of uniform horizontal...
• 10N.1.HL.TZ0.27: The resistance of the coil is \({\text{5.0 }}\Omega \). Which of the following is the average...
• 10N.1.HL.TZ0.26: Which of the following gives the correct times at which the magnitude of the magnetic flux...
• 09M.1.HL.TZ1.25: In order to reduce power losses in the transmission lines between a power station and a factory,...
• 09M.1.HL.TZ1.24: A permanent bar magnet is moved towards a coil of conducting wire wrapped around a non-conducting...
• 14M.2.HL.TZ2.5b: (i)     Determine the maximum emf induced between the ends of the metal rod. (ii)     Using the...
• 14M.2.HL.TZ2.5a: Define magnetic flux.
• 14N.2.HL.TZ0.6h.iii: The TV is on “standby” for 75% of the time. Calculate the energy wasted in one year by not...
• 14N.2.HL.TZ0.6h.ii: The efficiency of the transformer is 0.95. Determine the current supplied by the 230 V mains supply.
• 14N.2.HL.TZ0.6h.i: Calculate the power consumed by the internal circuits when the TV is in “standby” mode.
• 14N.2.HL.TZ0.6g: Real transformers are subject to energy loss. State and explain how two causes of these energy...
• 14N.2.HL.TZ0.6f: Outline the features of an ideal step-down transformer.
• 15N.2.HL.TZ0.8g: Outline why laminating the core improves the efficiency of a transformer.
• 15N.2.HL.TZ0.8f.iii: Determine the input voltage to the transformer if the power loss in the cables from the power...
• 15N.2.HL.TZ0.8f.ii: Calculate the power supplied to the transformer.
• 15N.2.HL.TZ0.8f.i: Calculate the current in the cables connected to the town
• 15N.2.HL.TZ0.8e: The primary coil has 25 turns and is connected to an alternating supply with an input voltage of...
• 15N.2.HL.TZ0.8d: Outline, with reference to electromagnetic induction, how a voltage is induced across the...
• 15N.1.HL.TZ0.21: An alternating current is sinusoidal and has a maximum value of 1.5 A. What is the approximate...
• 15N.1.HL.TZ0.20: An aircraft with a wing span of 50 m flies horizontally at a speed of...
• 15M.1.HL.TZ1.20: Faraday’s law of electromagnetic induction states that the electromotive force (emf) induced in a...
• 15M.1.HL.TZ1.21: The graph below shows the variation with time of an alternating current in a resistor of...
• 15M.1.HL.TZ2.18: A magnet oscillates above a solenoid as shown. The magnet is displaced vertically and released...
• 15M.1.HL.TZ2.19: Two identical resistors R are connected in series to an alternating current (ac) power supply....
• 15M.2.HL.TZ1.8d: Explain, with reference to electromagnetic induction, the effect of the motion of the coil on the...
• 15M.2.HL.TZ2.5a: Calculate the electromotive force (emf) induced in the coil at the instant just before the whole...
• 15M.2.HL.TZ2.5b: Suggest why the time taken for the whole of the coil to enter the magnetic field increases if the...
• 14M.1.HL.TZ1.25: The graph shows the variation with time t of the power P produced in a coil that is rotating in a...
• 14M.1.HL.TZ1.26: A bar magnet is close to a coil. No other magnetic fields are present. An ammeter is connected to...
• 14M.1.HL.TZ2.24: The diagram shows a loop L of wire in a uniform magnetic field B. The loop encloses an area A...
• 14M.1.HL.TZ2.25: The voltage output of a particular power station is stepped up by a factor of 103. As a result...
• 14M.2.HL.TZ1.5b: The following data are available. Resistance of ring = 3.0×10–3ΩInitial magnetic flux =...
• 14M.2.HL.TZ1.5a: State and explain the direction of the current induced in the ring during this change.
• 14N.1.HL.TZ0.20: A flat coil with N turns has a cross-sectional area A. The coil has a flux density of B in a...
• 14N.1.HL.TZ0.21: The graph shows the variation with time of a magnetic flux passing through a loop of...
• 11N.1.HL.TZ0.24: The peak value of an alternating sinusoidal potential difference is 100V. The approximate rms...
• 11N.1.HL.TZ0.25: The diagram shows the view from above as an airplane flies horizontally through the Earth’s...
• 12N.1.HL.TZ0.30: A coil and a magnet can move horizontally to the left or to the right at the same speed. In...
• 12N.1.HL.TZ0.32: The graph shows the variation with time t of the output voltage V of a generator. Assuming all...
• 12N.1.HL.TZ0.39: The capacitance of a device is defined as the A. charge stored by the device.B. energy stored by...
• 12N.1.HL.TZ0.31: In an ideal transformer I. the power output exceeds the power inputII. the magnetic flux...
• 13N.1.HL.TZ0.39: Capacitance of a capacitor is defined as the A. ability to store electrical charge.B. ratio of...
• 13M.1.HL.TZ1.26: An ideal transformer has 200 turns of wire on the primary coil and 600 turns on the secondary...
• 13M.1.HL.TZ1.25: A uniform magnetic field directed into the page occupies a region of width L.  A conducting coil...
• 12M.1.HL.TZ2.24: The magnetic flux Φ through a coil with 1000 turns varies with time t as shown in the...
• 12M.1.HL.TZ2.25: A coil rotates in a magnetic field. The emf ε produced in the coil varies sinusoidally with time...
• 13M.2.HL.TZ1.6b: The magnet is now suspended from a spring. The magnet is displaced vertically and starts to...
• 13M.2.HL.TZ1.6a:  A bar magnet falls vertically from rest through a coil of wire. The potential difference (pd)...
• 11M.1.HL.TZ2.23: The graph shows the...
• 11M.1.HL.TZ2.24: The rms...
• 12M.1.HL.TZ1.23: A length of copper wire PQ is moved downwards through the poles of two horizontal bar magnets as...
• 12M.1.HL.TZ1.24: The rms voltage of a sinusoidal electricity supply is 110V. The maximum potential difference...
• 13M.1.HL.TZ2.24: An alternating current generator produces a root mean squared (rms) emf of ε at a frequency f....
• 13M.1.HL.TZ2.23: An ideal transformer has a primary coil with Np turns and a secondary coil with Ns turns. The...
• 11M.2.HL.TZ2.6a: ...
• 11M.2.HL.TZ2.6b: ...
• 12M.2.HL.TZ2.6b: The length of the rod in (a) is 1.2 m and its speed is 6.2 m s–1. The induced emf is 15 mV. (i)...
• 12M.2.HL.TZ2.6a: A rod made of conducting material is in a region of uniform magnetic field. It is...
• 12M.2.HL.TZ1.6a: State Lenz’s law.
• 12M.2.HL.TZ1.6b: Two identical aluminium balls are dropped simultaneously from the same height. Ball P falls...
• 11N.2.HL.TZ0.7a: On the axes provided, draw a graph to show (i) the variation with time t of the vertical...
• 11N.2.HL.TZ0.7b: The length of the rod is 0.18 m and the magnitude of the magnetic field is 58 μT. The frequency...
• 11N.2.HL.TZ0.7c: The frequency of the motion is doubled without any change in the amplitude of the motion. State...
• 13N.2.HL.TZ0.5a: A loop of copper wire in a region of uniform magnetic field is rotated about a horizontal...
• 13N.2.HL.TZ0.5b: The loop in (a) is connected in series with a resistor of resistance 15 Ω. The root mean squared...
• 11M.1.HL.TZ1.19: A coil of wire has a large number of turns. It is moved relative to a fixed magnetic field. The...
• 11M.1.HL.TZ1.20: A sinusoidal ac power supply has rms voltage V and supplies rms current I. What is the maximum...
• 11M.2.HL.TZ1.13c: A square loop of conducting wire is placed near a straight wire carrying a constant current I....