A bar magnet is cut into two equal halves by a plane parallel to the magnetic axis of the following physical quantities the one which remains unchanged is

Abar magnet is cut into two equal halves by a plane parallel to the magnetic axis of the following physicla quntities the one which remains unchanged is

Which one of the following physical quantities is a dimensional variable?

Which one of the following physical quantities is not a fundamental quantity?

A thin magnetic needle vibrates in the horizontal plane with a period of 4s. The needle is cut into two halves by a plane normal to the magnetic axis of the needle. Then, the period of vibration of each half needle is approximately

Which one of the following is dimensionless physical quantity?