Question 1

Marks: 1

An ion of mass m kg carrying a charge of –Q pC travels horizontally with a kinetic energy of E_k = 10 eV. 5-1-sl-mcq-hard-q1-phy

It enters a uniform vertical electric field of strength V kV m^–1, which is directed downwards and acts over a horizontal distance of 100 cm.

Which row in the table below correctly shows the time for the ion to pass through the field, and the magnitude of the force on the ion?

	time / s	force
A.	$\frac{\sqrt{m}}{4 \sqrt{10^{- 19}}}$	F nN
B.	$\frac{\sqrt{m}}{4 \sqrt{2} \sqrt{10^{- 19}}}$	F nN
C.	$\frac{\sqrt{m}}{4 \sqrt{2} \times 10^{- 19}}$	F µN
D.	$\frac{\sqrt{m}}{4 \sqrt{2} \sqrt{10^{- 19}}}$	F µN

Key Concepts

Electric Fields

Question 2

Marks: 1

Point charges, each of magnitude Q are placed at three corners of a square as shown in the diagram.

fVmu8cD3_qu-13

What is the direction of the resultant electric field at the corner with no charge?

Question 3

Marks: 1

Which one of the following cannot be used as a unit for electric field strength?

N A^–1 s^–1
m kg A^–1 s^–3
m kg s^–1C^–1
J A^–1 s^–1 m^–1

Question 4

Marks: 1

What is the electric field pattern between a conducting sphere and an earthed metal plate?

qu-14

Question 5

Marks: 1

A +1.0 nC and −1.5 nC point charge are placed 6 cm apart at points P and Q. A point R is equidistant to both charges.

5-1-sl-mcq-hard-q5-phy

If an additional charge of +4.0 nC is supplied to both charges, what is the magnitude of the electric field at R and the direction of this field?

	Magnitude of electric field strength	Direction of electric field
A.	0.3 k × 10⁻⁵ N C⁻¹	Towards X
B.	0.3 k × 10⁻⁵ N C⁻¹	Towards Y
C.	0.1 k × 10⁻¹¹ N C⁻¹	Towards X
D.	0.2 k × 10⁻¹³ N C⁻¹	Towards Y

Key Concepts

Electric Fields

Question 6

Marks: 1

A student queries their answer after solving some physics problems. The teacher explains that the problem lies in the text book solutions, some of which are incorrect.

An extract from the mark scheme is shown below:

5-1-mcq-h-q6-qun

Without calculation, which answer does the teacher know to be an error?

1.
2a.
2c.
3.

Key Concepts

Charge

Question 7

Marks: 1

Electric field strength is defined as 'the electric force per unit charge experienced by a small, positive point charge q'.

Why is the test charge described as 'small'?

Because electrons are small.
To obey Coulomb's law for point charges.
So that the electric field is not distorted.
So that the test charge does not exert a force on other charges in the region.

Key Concepts

Electric Fields
Coulomb's Law

Question 8

Marks: 1

The electric potential at different points between two point charges is shown.

5-1-sl-mcq-hard-q8-phy

The electric field strength E varies along the line which connects P and Q.

Which graph correctly shows this variation, where x is the distance along the line PQ?

5-1-sl-mcq-hard-q8_2-phy

Key Concepts

Electric Fields
Coulomb's Law

Question 9

Marks: 1

The diagram shows points X, Y and Z marked on a pattern of electric field lines. The spacing between X and Y and between Y and Z are the same.

5-1-sl-mcq-hard-q10-phy

The potential at X = 0 V and at Y is − 500 V.

What is a likely value for the potential at Z?

− 600 V
− 850 V
− 1000 V
− 1200 V

Key Concepts

Electric Fields

DP IB Physics: HL

Topic Questions

5.1 Electric Fields

Question 1

Key Concepts

Question 2

Question 3

Question 4

Question 5

Key Concepts

Question 6

Key Concepts

Question 7

Key Concepts

Question 8

Key Concepts

Question 9

Key Concepts

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