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Question

A bar magnet of moment M=^i+^j is placed in a magnetic field induction B=3^i+4^j+4^k. The torque acting on the magnet is-

A
^i+^j+^k
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B
^i^j
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C
^i+^k
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D
4^i4^j+^k
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Solution

The correct option is D 4^i4^j+^k
τ=M×B

=(^i+^j) ×(3^i+4^j+4^k)

=4^k4^j3^k+4^i

τ=4^i4^j+^k

<!--td {border: 1px solid #ccc;}br {mso-data-placement:same-cell;}--> Hence, (D) is the correct answer.

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