Using a bar magnet P, a vibration magnetometer has time period 2 … - Vidyadip

MCQ

Using a bar magnet $ P,$ a vibration magnetometer has time period $2$ $seconds$. When a bar $Q$ (identical to $P$ in mass and size) is placed on top of $P$, the time period is unchanged. Which of the following statements is true

A
$Q$ is of non-magnetic material
✓
$Q$ is a bar magnet identical to $P$, and its north pole placed on top of $P's$ north pole
C
$Q $ is of unmagnetized ferromagnetic material
D
Nothing can be said about $Q's$ properties

✓

Answer

Correct option: B.

$Q$ is a bar magnet identical to $P$, and its north pole placed on top of $P's$ north pole

b
(b)$T = 2\pi \sqrt {\frac{I}{{M{B_H}}}} $. If $Q$ is an identical bar magnet then time period of system will be $T' = 2\pi \sqrt {\frac{{2I}}{{(2M){B_H}}}} = T$

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