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2 Electricity

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Question 16
F

A student sets up the apparatus shown in the figure to test whether two charged rods exert a force on each other when they are not touching. Rod A hangs from a nylon thread. Rod B is held in a clamp a short distance away. Both rods are made of polythene and both have been rubbed with the same dry cloth.

Figure: Apparatus used to test the force between two charged polythene rods that are not touching

image

a.

Give the type of charge on each of the two polythene rods.

[1]
b.

Describe what the student will see happen to rod A.

[1]
c.

Rod B is moved closer to rod A. Rod A now swings further away than it did before.

Explain why rod A swings further when rod B is moved closer.

[2]
d.

The student replaces rod B with an acetate rod that has been rubbed with the same cloth. Rod A now swings towards rod B.

Explain what this shows about the charge on the acetate rod.

[2]
Markscheme

2 Electricity Questions

  1. GCSE
  2. /Physics
  3. /2 Electricity

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