GCSE Edexcel Physics Density ρ: This question is about static el

Question

This question is about static electricity.
(a) A student has a rubber balloon tied to a long piece of cotton thread.
The student gives the balloon an overall electrostatic charge.
(i) Describe one way that the student could give the balloon an overall electrostatic charge.

(ii) The student gives the balloon an overall negative charge.
Which of these sentences explains why the overall charge on the balloon is negative?

A Negative charge has been removed from the balloon.
B Positive charge has been added to the balloon.
C Positive charge has been removed from the balloon.
D Positive charge has been added to the balloon.

(iii) The student charges another balloon on a long thread.
Explain how the student can show that the two balloons have the same type of charge.

(b) Figure 9 shows a plastic block and a metal disc with an insulating handle. The top surface of the plastic block has a negative charge. The metal disc has no overall electric charge.

A student uses the insulating handle to hold the metal disc above the plastic block.
(ii) Which of these diagrams shows how the charge is distributed on the metal disc?

A B C D

(ii) The student keeps holding the metal disc above the charged plastic block and taps the metal disc with a finger.
This earths the metal disc for a short time.
Explain why the disc now has an overall positive charge.

(iii) Figure 10 shows the charges on part of the metal disc and the plastic block.
Draw lines on Figure 10 to show the shape and direction of the electric field between the metal disc and the plastic block.

This question is about static electricity - Edexcel - GCSE Physics - Question 4 - 2020 - Paper 1

Worked Solution & Example Answer:This question is about static electricity - Edexcel - GCSE Physics - Question 4 - 2020 - Paper 1

Describe one way that the student could give the balloon an overall electrostatic charge.

Which of these sentences explains why the overall charge on the balloon is negative?

Explain how the student can show that the two balloons have the same type of charge.

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