Question

In earth 's magnetic field bh if the frequency of oscillation of a magnetic needle is n then

Answer 1

Answer : option (B)

explanation : here needle is oscillate in the earth magnetic field.

so, time period of oscillation of needle in uniform earth's magnetic field is given by, ......(1)

where I is moment of inertia of needle about its axis , M is the magnetic moment of needle. and is earth's magnetic field.

now, relation between time period and frequency is given by,

.....(2)

so, frequency of needle in uniform earth's magnetic field is given by,

[ from equations (1) and (2), ]

here it is clear that,

or,

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