Static electricity

Objects can be charged by rubbing them with a cloth.

The diagram shows a plastic rod which has become charged.

Which statement correctly describes the plastic rod?

A The rod has an overall negative charge.

B The rod has an overall positive charge.

C The rod has gained neutrons.

D The rod has gained protons.

An object is rubbed with a cloth and becomes positively charged.

Which sentence explains how the object becomes positively charged?

A Electrons move from the cloth to the object.

B Electrons move from the object to the cloth.

C Protons move from the cloth to the object.

D Protons move from the object to the cloth.

A positively charged rod is rubbed across the brass cap of the gold leaf electroscope.

Complete the sentence to explain how the gold leaf electroscope becomes positively charged.

Use words from the list.

Electrons Gold leaf electroscope Neutrons Protons

Positively charged rod

........ move from the........ to the........

When the gold leaf electroscope is positively charged, the gold leaf rises.

Fig. 15.2 shows the positively charged gold leaf electroscope.

Fig. 15.2

Explain why the gold leaf rises.

A scientist earths the cap of the positively charged gold leaf electroscope by touching it with their finger.

Complete Fig. 15.3 to show what happens to the gold leaf. Explain your answer.

Fig. 15.3

A positively charged rod is rubbed across the brass cap of the gold leaf electroscope.

Complete the sentence to explain how the gold leaf electroscope becomes positively charged.

Use words from the list.

Electrons Gold leaf electroscope Neutrons Protons

Positively charged rod

........ move from the........ to the........

When the gold leaf electroscope is positively charged, the gold leaf rises.

Fig. 11.2 shows the positively charged gold leaf electroscope.

Fig. 11.2

Explain why the gold leaf rises.

A scientist earths the cap of the positively charged gold leaf electroscope by touching it with their finger.

Complete Fig. 11.3 to show what happens to the gold leaf. Explain your answer.

Fig. 11.3

The diagram shows a positively charged rod near a small piece of paper.

The paper is attracted to the rod.

Which diagram shows the correct distribution of positive and negative charges in the piece of paper as the rod is brought closer?

A student uses friction to charge a piece of plastic.

Which statement explains why the plastic becomes negatively charged?

A The plastic gains electrons.

B The plastic gains protons.

C The plastic loses electrons.

D The plastic loses protons.

Which row of the table describes charge and current?

A teacher demonstrates static electricity using a Van de Graaff generator.

She places 3 metal foil containers on top of the dome of the Van de Graaff generator. When the Van de Graaff generator is turned on, the foil containers fly off the dome one by one.

Explain why this happens.

Use ideas about charge in your answer.

Calculate how long it would take for a charge of 5.0 C to flow with a current of 25 mA.

Use the equation: Charge flow = Current × Time