Question

A frog can be levitated in magnetic field produced by a current in a vertical solenoid placed below the frog. This is possible because the body of the frog behaves as

• A. Paramagnetic
• B. Diamagnetic
• C. Ferromagnetic
• D. Anti-ferromagnetic

Answer 1

The correct option is B Diamagnetic

To levitate a body, a force must be applied on it which at least balances the body's weight. Since weight will always pull the frog down, the magnetic force on the frog due to the vertical solenoid placed below it must act in the upward direction. Thus, the frog is repelled by the magnetic field. Diamagnetic substances are the only substances which are repelled by a magnetic field. This shows that the body of the frog behaves diamagnetically.