AQA A Level Physics

Topic Questions

A LevelPhysicsAQATopic Questions7. Fields & Their Consequences7.5 Electric Potential

7.5 Electric Potential

DownloadView
Easy
Medium
Hard
Easy
Medium
Hard
11 mark

Which one of the following statements about electric potential is correct?

  • Electric potential is a vector quantity

  • Electric potential is a scalar quantity

  • Electric potential is not zero unless the electric field strength is zero

  • The potential gradient is inversely proportional to the electric field strength 

Choose your answer

Did this page help you?

21 mark

The potentials are point X and Y due to the +3.0 nC charge are 629 V and 413 V respectively.

7-5-mcq--q2-easy-aqa-a-level-physics

How much work is done on the 3.0 nC charge where it is moved from X to Y.

  • 1.2 × 10–7 J

  • 6.5 × 10–7 J

  • 1.9 × 10–7 J

  • 3.7 × 10–7 J

Choose your answer

Did this page help you?

31 mark

What is the electric potential at an infinite distance away from a point charge?

  • negative infinity

  • 1

  • infinity

  • 0

Choose your answer

Did this page help you?

41 mark

Which of these is the standard unit for the change in electric potential?

  • V

  • J kg–1

  • J C–1

  • J

Choose your answer

Did this page help you?

51 mark

Which of the diagrams is not an accurate representation of equipotential lines?

7-5-mcq--q5-easy-aqa-a-level-physics

Choose your answer

Did this page help you?

11 mark

A point that is 5.2 cm from a –8.0 nC point charge has an electric potential of  –250 J C–1. 

At what distance does the electric potential decrease to –300 J C–1?

  • 5.0 cm

  • 6.8 cm

  • 6.0 cm

  • 2.5 cm

Choose your answer

Did this page help you?

21 mark

Two points charges of +4Q and –Q are placed 150 mm apart. 

Which of the following graphs shows the variation of the potential V against the distance x along the line joining the two point charges?

7-5-mcq--q2-medium-aqa-a-level-physics

Choose your answer

Did this page help you?

31 mark

Two identical negative point charges, P and Q, are separated by a distance of 6.0 mm. The resultant electric potential at point M, which is mid–way between the charges, is –40 V.

7-5-mcq--q3-medium-aqa-a-level-physics

What would be the resultant electrical potential at a point 2.0 mm closer to Q?

  • –90 V

  • –72 V

  • –48 V

  • –60 V

Choose your answer

Did this page help you?

41 mark

The diagram shows four point charges at the corners of a square of side 4a.

7-5-mcq--q4-hard-aqa-a-level-physics

What is the electric potential at P, the centre of the square?

  • negative fraction numerator Q over denominator pi epsilon subscript 0 square root of 2 a end fraction

  • negative fraction numerator Q over denominator 2 pi epsilon subscript 0 square root of 2 a end fraction

  • negative fraction numerator Q over denominator 2 pi epsilon subscript 0 a end fraction

  • negative fraction numerator Q over denominator 4 pi epsilon subscript 0 a end fraction

Choose your answer

Did this page help you?

51 mark

The diagram shows a uniform electric field in which equipotential lines are placed 3.0 cm apart.

7-5-mcq--q5-hard-aqa-a-level-physics

A charge of –6.0 nC is placed at the equipotential line X. 

Which of the following statements is correct? 

  • The charge is in an electric field directed from Z to X and has a gain of 4.8 × 10–7 J of kinetic energy moving from X to Z

  • The charge is in an electric field directed from X to Y and has a loss of 2.4 × 10–7 J of kinetic energy moving from Y to Z

  • The charge is in an electric field directed from X to Y and has a gain of 1.2 × 10–7 J of kinetic energy moving from Y to Z

  • The charge is in an electric field directed from X to Z and has a loss of 1.2 × 10–7 J of kinetic energy moving from Y to Z

Choose your answer

Did this page help you?

11 mark

Two charges, R and S, are 100 mm apart.

7-5-mcq--q1-medium-aqa-a-level-physics

X is a point on the line between R and S. If the potential at X is 0 V, what is the distance from S to X?

  • 30 mm

  • 70 mm

  • 50 mm

  • 60 mm

Choose your answer

Did this page help you?

21 mark

What is the distance from a 9.5 µC point charge where the electric potential is equal to 21 MJ C–1.

  • 64 mm

  • 4.1 µm

  • 2.0 mm

  • 4.1 mm

Choose your answer

Did this page help you?

31 mark

An electron and an alpha particle are 3.0 nm apart. In the absence of other charges, what is the electric potential energy of the electron?

  • –1.5 × 10–19 J

  • +1.5 × 10–19 J

  • –5.1 × 10–11 J

  • +5.1 × 10–11 J

Choose your answer

Did this page help you?

41 mark

The diagram below shows the field lines and equipotential lines around an isolated negative point charge.

7-5-mcq--q4-medium-aqa-a-level-physics

Which one of the following statements when a small charge is moved in the field is incorrect?

  • When it is moved from Q to P or R to S the work done is the same in each case

  • It has a larger potential energy at Q than at S

  • When it is moved from Q to R it is twice the work done in moving it from P to S

  • It has a larger electric potential energy at R than at S

Choose your answer

Did this page help you?

51 mark

Two horizontal parallel plate conductors are separated by air. The lower plate is earthed and the potential of the upper plate is +70 V. An ion is placed midway between the plates.

7-5-mcq--q5-medium-aqa-a-level-physics

What is the electric potential energy of the ion?

  • 6.4 × 10–17 J

  • 2.2 × 10–17 J

  • 5.8 × 10–17 J

  • 1.1 × 10–17 J

Choose your answer

Did this page help you?