Using a bar magnet P, a vibration magnetometer has time period 2 seconds . When a bar Q (identical t

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5.Magnetism and Matter

easy

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

$Q$ 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

$Q $ is of unmagnetized ferromagnetic material

Nothing can be said about $Q's$ properties

Solution

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

Standard 12

Physics

In a vibration magnetometer, the time period of a bar magnet oscillating in horizontal component of earth's magnetic field is $2$ $sec$. When a magnet is brought near and parallel to it, the time period reduces to $1 $ $sec$. The ratio $H/F $ of the horizontal component $H$ and the field $F$ due to magnet will be

medium

The number of turns and radius of cross-section of the coil of a tangent galvanometer are doubled. The reduction factor $K $ will be

easy

Tangent galvanometer is used to measure

easy

(AIPMT-2001)

If a brass bar is placed on a vibrating magnet, then its time period

easy

Two different magnets are tied together and allowed to vibrate in a horizontal plane. When their like poles are joined, time period of oscillation is $5 \,s$ and with unlike poles joined, time period of oscillation is $15 \,s$. The ratio of their magnetic moments is

medium

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

Solution

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