Electromagnets

Question 1

Increase strength of electromagnet by (3)

Answer 1

Increase number of coils

Increase current

Wrap could around a soft iron core

Question 2

Explain the motor effect

Answer 2

A wire placed in a magnetic field whilst carrying a current will experience a force

Question 3

For the motor effect to work the wire mud be

Answer 3

Perpendicular to the magnetic field

Question 4

Motor effect

Reverse direction of force by (2)

Answer 4

Reverse current

Reverse magnetic field

Question 5

Motor effect

Increase size of force by (4)

Answer 5

Increase current

Use a stronger magnet

increase number of coils

Use a soft iron core

Question 6

Split ring commutators do what

Answer 6

Reverse the direction of the current every half turn

Question 7

Electromagnetic induction is

Answer 7

A magnet is placed in a cool of wire and moved

Induces a pd in the coil

Question 8

Of is only induced when

Answer 8

There is movement

Question 9

Increase induced of by ( 3)

Answer 9

Increase speed of movement

Increase strength of magnetic field

Increase number of coils