Topic 6 - Electromagnetism

Question 1

what does an electric current in a conductor produce?

Answer 1

a magnetic field around the conductor

Question 2

what does a larger current in a conductor mean?

Answer 2

the magnetic field becomes stronger

Question 3

what does direction of the magnetic field around the conductor depend on?

Answer 3

the direction of the current through the conductor

Question 4

what is a soft magnetic material?

Answer 4

a magnetic material that looses its induced voltage quickly

Question 5

what is a hard magnetic material?

Answer 5

a magnetic material that keeps its induced voltage permanently

Question 6

what is an example of a soft magnetic material?

Answer 6

iron

Question 7

what is an example of a hard magnetic material?

Answer 7

steel

Question 8

why is iron used in transformers?

Answer 8

it is a soft magnetic material, so it can magnetise and demagnetise quickly

Question 9

how can you increase the strength of a magnetic field around a solenoid?

Answer 9

adding a magnetically soft iron core through the middle of the coil