Electric Fields

Question 1

What are the 4 ways of removing an electron from an atom?

Answer 1

• electrical current
• heat
• Radiation (Electromagnetic) (photoelectric effect)
• Friction

Question 2

Draw a diagram of + describe a shuttling ball experiment

Answer 2

Question 3

Draw the electromagnetic field around a magnet

Answer 3

Question 4

What is a dipole

Answer 4

When there is both North And South poles: magnets are always in dipole

Question 5

What is the relationship between electric field strength and distance from the charge

Answer 5

It is in inverse:

Question 6

Diagram for the electric field of attracting/ repelling point charges

Answer 6

Question 7

Diagram of a uniform electric field

Answer 7

Question 8

Diagram of a charged point near to an oppositely charged plate

Answer 8

Question 9

Electric potential def

Answer 9

Work done per unit charge (on a positive charge) in moving the charge from infinity to that point

Question 10

Where is electric potential greatest

Answer 10

At the surface of a charge (decreases as distance from the charge increases - at infinity, potential is 0V)

Question 11

How does v change with r

Answer 11

Question 12

What is electric potential difference

Answer 12

The energy needed to move a unit charge between two points in an electric field

Question 13

Draw a graph showing how V can be calculated using a graph

Answer 13

Question 14

Electric field strength def

Answer 14

The force per unit positive charge (vector quantity)