Question

If a bar magnet cut into two pieces in unequal length what will be their strength

Answer 1

If a bar magnet is cut into two unequal parts their strength will be same.

When they are cut the two poles are developed on their both sides. the poles have the same power as it is cut from a specific origin. You should have read that the strength of a permanent magnet cannot be increased. the strength of an electromagnet can be increased.