Electrostatics

Question 1

What materials are needed for something to become charged?

Answer 1

Insulating materials

Question 2

What is it called when something become charged

Answer 2

Electrostatic charge

Question 3

If one bodies is negatively charged and the other positively what will they do?

Answer 3

Attract each other

Question 4

When a polythene rod is rubbed with a woollen cloth electrons move from the cloth to the polythene rod. What charge does the rod have?

Answer 4

Negative, as electrons have a negative charge

Question 5

When acetate is rub against a woollen cloth electrons move on the cloth. The rod become positively charged. Why?

Answer 5

It’s lost negatively charged electrons

Question 6

Negative charge mean extra electrons. What does positive charge mean?

Answer 6

Lack of electrons

Question 7

What are atoms or molecules that have become charged called?

Answer 7

Ions

Question 8

How is soot and ash removed in power stations?

Answer 8

By a Electrostatic smoke precipitator

Question 9

How is soot and ash removed in power stations?

Answer 9

By a Electrostatic smoke precipitator

Question 10

What picks up smoke particles

Answer 10

A charged metal grid.

Question 11

What happens inside smoke precipitators

Answer 11

Smoke particles pick up electrons from the grid and become negatively charged themselves from the negatively charged grid. The grid now repeals the negative smoke particles towards the chimney lining. Where they are attracted by largely positively charged collecting plates. The smoke particles lose charge on collecting particles and collect together at the bottom of the chimney.

Question 12

What are photoconductors

Answer 12

Things that conduct electricity in the light

Question 13

How is a spark caused?

Answer 13

When a static charge on an object is large, electrons may jump across the gap from the charged gap to a nearby conductor.

Question 14

What is earthing?

Answer 14

It involves connecting a charged body to a metal spike or place in the ground so it’s discharged, and its potential remains close to zero.

Question 15

What things are earthed?

Answer 15

Petrol storage tanks and aircrafts are earthed.

Question 16

What do conducting tails do?

Answer 16

Cars are fit with conducting tails to prevent build up of charge. As the car moves electrons are transferred from the ground to the car. Discharging reduces risks of unpleasant spark, when refuelled.

Question 17

What happens to aircraft tyres

Answer 17

There is friction between aircraft tyres and the runway. To reduce build up of charge they’re made of special rubber that conducts electricity, so charge goes straight to the earth.

Question 18

How can fabrics be anti static?

Answer 18

Buy anti static liquids, that conduct electricity and prevent build up of charge. Fabric conditioners contain a chemical that coats clothing with a layer that conducts charge.

Question 19

Paint sprays

Answer 19

Particles become charged as they’re being sprayed. The object has an opposite charge so that the paint attracts to it. Paint particles repel as the have same charge, creates finer spray.

Question 20

What do defibrillators do?

Answer 20

They restart a persons heart, when it’s stopped beating. Charge passes through paddles to the patients chest. Paddles have insulating handles to stop others from getting electrostatic-ly shocked.

Question 21

How do printers work?

Answer 21

Laser printer has a drum which becomes negatively charged where laser shines on it. Toner is negatively charged so sticks to the drum that’s positively charged, then image is transferred.