International A LevelPhysicsEdexcelTopic Questions4. Further Mechanics, Fields & ParticlesElectric Fields

Electric Fields (Edexcel International A Level Physics)

Topic Questions

DownloadView
Medium
Hard
Medium
Hard
1a
Sme Calculator3 marks

A point positive charge and a point negative charge are placed 8.0 cm apart at X and Y, as shown.

straight X with ● on top                                               straight Y with ● on top

Calculate the magnitude of the electric field strength midway between X and Y.
   charge at X = + 2.5 × 10–7 C
   charge at Y = – 2.5 × 10–7 C




Electric field strength = .......................................

How did you do?

1b
Sme Calculator7 marks

The diagram below represents the electric field for this combination of charges.

q16b-wph14-04-june-2021-edexcel-int-as-and-a-level-phy

i)
Add dashed lines to the electric field diagram to show equipotentials for this combination of charges.

(3)

ii)

A textbook states, “An electric field line shows the path a free positive test charge follows”.

Discuss the accuracy of this statement for free positive test charges placed at point A and at point B.

(4)

How did you do?

1c
Sme Calculator5 marks

The charges at X and Y are replaced by charges of twice the magnitude.

q16c-wph14-04-june-2021-edexcel-int-as-and-a-level-phy

C and D are points between the charges.

Determine the magnitude of the potential difference between points C and D.

charge at X = + 5.0 × 10–7 C
charge at Y = – 5.0 × 10–7 C




Magnitude of potential difference = .........................................

How did you do?

Did this page help you?

1a
Sme Calculator3 marks

There is an electric field around a helium nucleus.

Calculate the electric potential at a distance 26.6 × 10–12 m from a helium He presubscript 2 presuperscript 4 nucleus.





Electric potential = .........................................

How did you do?

1b
Sme Calculator1 mark
State one assumption made for this calculation.

How did you do?

Did this page help you?

2a
Sme Calculator3 marks

A spark chamber consists of a set of parallel metal plates. It can reveal the path of a high energy particle as shown.

q16-wph14-04-oct-2021-edexcel-int-as-and-a-level-phy

A potential difference of 10.5kV is applied across two adjacent plates as shown below.

q16-1-wph14-04-oct-2021-edexcel-int-as-and-a-level-phy

Sketch lines to represent the electric field between the plates.

(3)

How did you do?

2b
Sme Calculator5 marks

A high energy particle causes ionisation of the atoms in the space between the plates.

i)
Show that the force on an ionised atom due to the electric field is about 2.6 × 10–13 N.

   charge on ionised atom = 1.60 × 10–19 C
   distance between plates = 6.40 mm

(3)

ii)
The ionised atom travels 0.2 μm in the direction perpendicular to the plates before colliding with another atom.

Deduce whether the collision could lead to further ionisation.

ionisation energy of atoms = 3.9 × 10–19 J
(2)

How did you do?

Did this page help you?

3
Sme Calculator3 marks

The diagram represents a negative point charge.

Draw field lines to show the electric field around the charge.

q11-wph14-04-jan-2022-edexcel-int-as-a-level-phy

(3)

How did you do?

Did this page help you?

4a
Sme Calculator6 marks

The surface of a balloon can become charged by rubbing it against clothing. The charge on the surface of the balloon can be assumed to act as if it was concentrated at the balloon’s centre.

Two balloons are suspended by cotton threads so that they just touch each other as shown in diagram 1. The two balloons are then given an equal negative charge and repel as shown in diagram 2. The dots represent the centre of each balloon.

q13-wph14-04-jan-2022-edexcel-int-as-a-level-phy

i)
Show that the force of repulsion between the balloons in diagram 2 is about 1 × 10−3 N.

mass of each balloon = 1.1 grams

(4)

ii)
Show that the charge on each balloon is about 2 × 10−7 C.

(2)

How did you do?

4b
Sme Calculator2 marks

One balloon is removed and the remaining balloon returns to its original position.

Calculate the electric potential at a distance of 0.30 m from the centre of the remaining balloon.




Electric potential = ...............................

How did you do?

Did this page help you?