What happens if a bar magnet is broken in half? a. each half becomes demagnetized. b. each half becomes a new bar magnet with one magnetic pole. c. each half becomes a new bar magnet with two magnetic poles. d. the larger piece remains magnetized and the smaller piece is demagnetized.

c.  Each half becomes a new bar magnet with two magnetic poles.

Explanation:

As we know that each magnet must have two opposite poles at its two ends

1. North Pole

2. South pole

now we defined magnetic moment of the magnet as product of pole strength of magnet with its length.

Here as we brake a magnet into two pieces then each part of the magnet will again develop poles on two parts and each part will behave like a new magnet in which we will have two poles.

but in this case the magnetic moment of the magnet will change due to change in the length

Here magnetic pole strength will not change as it will not depends on the length of magnet