A bar magnet of length $l$ breadth $b$ mass $m$ is suspended horizontally in the earth's magnetic field and oscillates with period $T$ . If $l, m, b$ are doubled with pole strength remaining the same,the new period will be

8 T

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4 T

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\frac{T}{2}

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2 T

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Solution

The correct option is C $2 T$
if $l, m, b$ are doubled then period also gets doubled hence it is $2 T$ .

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A bar magnet of length l breadth b mass m is suspended horizontally in the earth's magnetic field and oscillates with period T. If l,m,b are doubled with pole strength remaining the same,the new period will be

The correct option is C 2Tif l,m,b are doubled then period also gets doubled hence it is 2T.

A bar magnet of length $l$ breadth $b$ mass $m$ is suspended horizontally in the earth's magnetic field and oscillates with period $T$ . If $l, m, b$ are doubled with pole strength remaining the same,the new period will be

The correct option is C $2 T$
if $l, m, b$ are doubled then period also gets doubled hence it is $2 T$ .