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

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

Key Concepts

Potential Difference
Electric Fields

Question 3

Marks: 1

A proton of mass m_pand 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, v_p?

v_p = $\sqrt{\frac{2 q V}{m_{p}}}$
v_p = $\frac{2 q V}{m_{p}}$
v_p= $\frac{q V}{{2 m}_{p}}$
v_p= qV

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

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	$\frac{F}{q}$
B.	10F	0.1F	$\frac{F}{q}$
C.	F	F	$\frac{F}{Q}$
D.	0.1F	10F	$\frac{F}{Q}$

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?

$\to$
$↑$
$\leftarrow$
$↓$

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

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

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 Q₁doubles and the separation distance trebles?

$\frac{1}{9}$
$\frac{2}{3}$
$\frac{2}{9}$
2

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

Key Concepts

Electric Current

DP IB Physics: HL

Topic Questions

5.1 Electric Fields

Question 1

Key Concepts

Question 2

Key Concepts

Question 3

Key Concepts

Question 4

Key Concepts

Question 5

Key Concepts

Question 6

Key Concepts

Question 7

Key Concepts

Question 8

Key Concepts

Question 9

Key Concepts

Question 10

Key Concepts

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