Static and charge

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Question 16
Medium

A student investigates static electricity using a latex balloon.

a.

Explain in terms of electrons why the latex balloon is normally uncharged.

[2]
b.

Explain in terms of electrons why the balloon becomes charged when the student rubs it against a woolen sweater.

[2]
c.

The diagram shows the electric field between two charges, X and Y.

Electric field lines between two charges, X on the left and Y on the right. Several curved lines connect X and Y, with arrows along the lines pointing from X towards Y. Additional field lines curve outwards from X (with arrows pointing away from X) and curve inwards towards Y (with arrows pointing towards Y).

State the signs of the charges X and Y. Use the diagram to explain your answer.

[3]
d.

Describe one similarity between this electric field line diagram and a magnetic field line diagram between two opposite magnetic poles.

[1]
e.

Calculate the charge when 450 J450\text{ J}450 J of energy is transferred with a potential difference of 18 V18\text{ V}18 V.

Use the equation: energy transferred=charge×potential difference\text{energy transferred} = \text{charge} \times \text{potential difference}energy transferred=charge×potential difference

[3]

Static and charge Questions

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