Question

A frog can jump higher than normal in a magnetic field because the tissues of a frog are
A) paramagnetic.
B) diamagnetic.
C) ferromagnetic.
D) antiferromagnetic.

Answer 1

Hint:It is said that the frog jumps much higher in a magnetic field. This implies that the frog must probably repel the magnetic field lines. Diamagnetic materials repel the magnetic field lines when placed in an external magnetic field.

Complete step by step answer.
Step 1: Based on diamagnetism, explain how the frog jumps higher in a magnetic field.
The property of a material by which it repels out the magnetic field lines of the external magnetic field is termed as diamagnetism.
The below diagram shows the repulsion of the field lines.

Here, the tissues of the frog must be diamagnetic in nature. This will allow the frog to repel the magnetic field lines and move out of the magnetic field. The frog is thus observed to make higher jumps than normal when placed in the magnetic field.

So the correct option is B.

Additional information: Paramagnetism is the property by which a magnetic material aligns its magnetic dipoles along the external field direction. These materials possess a weak magnetic field when placed in an external field and will have zero magnetization when the field is removed.
Ferromagnetic materials, on the other hand, get strongly magnetized in the presence of the external field and on removing the field their magnetization persists.
Antiferromagnetic materials do not possess spontaneous magnetization. The magnetic moments aligned in one direction are cancelled out by magnetic moments aligned in a reverse direction.

Note: When diamagnetic material is placed in an external field a field is induced in the material but will be in an opposite direction. This leads to the generation of a repulsive force and the material thus repels the external magnetic field. Here, the height of the frog’s jump is a measure of the strength of the applied magnetic field. Stronger the field higher will be the jump.