electromagnets

Question 1

what is an electromagnets?

Answer 1

A non-permanent magnet turned on and off by controlling the current through it.

Question 2

what is a solenoid?

Answer 2

Wire wound into a tight coil, part of an electromagnet.

Question 3

what is the Core?

Answer 3

Soft iron metal which the solenoid is wrapped around.

Question 4

What determines the strength of an electromagnet?

Answer 4

its strength depends on the current, the core and the number of coils in the solenoid. it increases with increasing current, greater number of turns and with an iron core.

Question 5

what are two different uses of electromagnets?

Answer 5

circuit breakers: it breaks a circuit if too much current is drawn from the mains, and bso protects appliances.
loudspeaker
bells

Question 6

what is a magnetic force?

Answer 6

A non-contact force from a magnet on a magnetic material

Question 7

what is a permanent magnet?

Answer 7

an object that is magnetic all of the time.

Question 8

Where on the magnet are the Magnetic poles?

Answer 8

They are located at the ends of a magnetic field, called north-seeking (N) and south-seeking poles (S)

Question 9

fill in the blanks:
Two ‘like’ magnetic poles _____
and two ‘unlike’ magnetic poles _____

Answer 9

repel
attract

Question 10

fill in the blanks: field lines flow from the _____ to the _____

Answer 10

north-seeking poles
south-seeking poles