First slide

Magnetism

Question

The time period of a freely suspended magnet does not depend upon

Moderate

A

Length of the magnet
B

The pole strength of magnet
C

The horizontal component of earth’s magnetic field
D

Length of the suspension

Solution

Explanation for key : (1) (2) & (3)
Time period of oscillation of magnetic needle is
$T = 2 π \sqrt{\frac{I}{M B_{H}}}$
Where $M = m \times 2 l$
1) By the above equation we say time period depends on magnetic length (2l)
2)Magnetic pole strength
3) Horizontal component of earth’s magnetic field.

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