ELECTRIC CHARGE

4 marks · Normal

Describe a method for investigating how insulating materials can be charged by friction. Include how you would test if the materials are charged.

Work this out on paper, then compare with the answer and worked solution below. With a free account you can submit written answers for marking.

Show answer

Must show: Rub two insulators together, Pre-check for existing charge, Test by bringing material near small pieces of paper, Observing attraction as evidence of charge

Also accept: Use an electroscope for charge detection

Common mistakes: Not testing for charge before rubbing; Not using insulators

Show mark scheme and worked solution

Marking points

M1 · 1 mark · States correct materials (insulators, e.g., plastic rod and cloth).

M1 · 1 mark · Describes checking charge pre-rubbing (with small pieces of paper or electroscope).

M1 · 1 mark · Describes rubbing the materials together to transfer charge.

A1 · 1 mark · Describes testing for charge after rubbing (attraction or electroscope leaf rise).

Worked solution

Select two insulating materials, such as a plastic rod and a cloth. Check each is uncharged by bringing them close to small pieces of paper—no movement shows they are uncharged. Rub the rod and the cloth together for a few seconds. Test each again near the paper: attraction shows they are now charged.