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DP IB Physics: SL

Topic Questions

Home / IB / Physics: SL / DP / Topic Questions / 5. Electricity & Magnetism / 5.1 Electric Fields / Multiple Choice


5.1 Electric Fields

Question 1

Marks: 1

Two separated, identical conducting spheres X and Y of charge –8 μC and +12 μC respectively, are brought into brief contact and then separated. What is the final charge distribution on X and Y?

 

X / μC

Y / μC

A.

-8

+12

B.

+10

+10

C.

+2

+2

D.

-4

+6

    Choose your answer
      
    Key Concepts
    Charge

    Question 2

    Marks: 1

    Which of the following statements about electric fields and potential differences is incorrect?

    • The presence of a potential difference requires an electric field

    • Work on or by an electron across a potential difference V is eV  

    • Work on or by an electron across a potential difference is path dependent

    • The electric field is a vector field

    Choose your answer
      

    Question 3

    Marks: 1

    A proton of mass mp and charge q is accelerated from rest across a potential difference, V of 5 × 10–2 V. What is the best estimate for the magnitude of the proton’s final velocity, vp?

    • vpsquare root of fraction numerator 2 q V over denominator m subscript p end fraction end root

    • vpfraction numerator 2 q V over denominator m subscript p end fraction

    • vp fraction numerator q V over denominator 2 m subscript p end fraction

    • vp = qV

    Choose your answer
      
    Key Concepts
    Potential Difference

    Question 4

    Marks: 1

    The Tolman-Stewart experiment sought to find evidence that mobile charge carriers inside conducting metals are negatively charged.

    It involved exploiting the inertia of ‘free’ charge carriers in the conductor. If the conductor was suddenly accelerated, a potential difference would be set up.

    Assuming positive charges are fixed in place and mobile charge carriers are negative, which of the following statements about the Tolman-Stewart experiment is incorrect?

    • Accelerating the conductor created an area of excess negative charge in it

    • Accelerating the conductor created an area of excess positive charge in it

    • Electrons have inertia 

    • The potential difference created by the acceleration was not measurable

    Choose your answer
      
    Key Concepts
    Charge

    Question 5

    Marks: 1

    A point charge q is placed near a large spherical charge Q = 10q. What is the magnitude of the force experienced by q and Q and the magnitude of the electric field E created by Q at the position of q?

     

    Magnitude of force experienced by q

    Magnitude of force experienced by Q

    Magnitude of E created by Q at position of q

    A.

    F

    F

    F over q

    B.

    10F

    0.1F

    F over q

    C.

    F

    F

    F over Q

    D.

    0.1F

    10F

    F over Q

      Choose your answer
        
      Key Concepts
      Charge
      Electric Fields

      Question 6

      Marks: 1

      Two identical point charges q create a resultant electric field at X.

      The line XY is a perpendicular bisector of the line joining both point charges.

       q16_electric-fields_ib-sl-physics-mcq

      Which vector most accurately depicts the direction of the resultant electric field at X?

      • rightwards arrow

      • upwards arrow

      • leftwards arrow

      • downwards arrow

      Choose your answer
        
      Key Concepts
      Electric Fields

      Question 7

      Marks: 1

      The electron drift speed in a copper wire of diameter 2.0 mm is 3 × 10–4 m s–1. Typically, the number of free electrons per unit volume for copper is on the order of magnitude 1028 m–3. What is the best estimate for the current in the wire?   

      • 480π A 

      • 0.48 A

      • 0.48π A 

      • 19.2 π A

      Choose your answer
        
      Key Concepts
      Drift Speed

      Question 8

      Marks: 1

      A conducting wire, carrying current flowing from X to Y, has a non-uniform cross-sectional area.

       q18_electric-fields_ib-sl-physics-mcq 

      Which statement is incorrect?

      • The current at X and Y is equal 

      • The drift speed at X is equal to the drift speed at Y

      • The charge density at X is equal to the charge density at Y

      • Charge is conserved at X and at Y

      Choose your answer
        
      Key Concepts
      Drift Speed

      Question 9

      Marks: 1

      Two charges, Q1 = q and Q2 = 4q are separated by a distance r and exert a force of magnitude F on each other. By what factor does the magnitude of the force change if the charge on Q1 doubles and the separation distance trebles?

      • 1 over 9

      • 2 over 3

      • 2 over 9

      • 2

      Choose your answer
        
      Key Concepts
      Coulomb's Law

      Question 10

      Marks: 1

      What is the definition of electric current?

      • The ratio of potential difference across a component to the resistance of the component 

      • The rate of flow of electric charge 

      • The energy transferred per unit of charge flowing through a component 

      • The chemical energy transferred to electrical energy per unit of charge flowing in a cell 

      Choose your answer
        
      Key Concepts
      Electric Current