Single Choice

A frog can be levitated in a 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 :

Aparamagnetic
Bdiamagnetic
Correct Answer
Cferromagnetic
Dantiferromagnetic

Solution

The correct answer is option (B).

Hint: Determine the kind of magnetic material the frog behaves as.

The frog can be levitated in a magnetic field produced by a current in a vertical solenoid.
Now, to levitate the frog, the force must be applied in such a way so that it at least balances the weight of the frog and pulls it down. So, the force must be acting in upward direction.
Th, the magnetic field repels the frog.
Diamagnetic substances are those which when placed in a magnetic field gets repelled by it.

Hence, the body of the frog behaves as a diamagnetic substance.
The correct answer is option (B).

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