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Question: A dipole of magnetic moment \(\overrightarrow { \mathrm { m } }\)30 \(\hat { \mathrm { j } } \mathr...

A dipole of magnetic moment m→\overrightarrow { \mathrm { m } }30 j^Am2\hat { \mathrm { j } } \mathrm { A } \mathrm { m } ^ { 2 } is placed along they-axis in a uniform magnetic field B = (2i + 5j)T. The torque acting on it is

A

−40k^Nm- 40 \hat { \mathrm { k } } \mathrm { N } \mathrm { m }

B

C

D

−70k^Nm- 70 \hat { \mathrm { k } } \mathrm { N } \mathrm { m }

Answer

Explanation

Solution

: Here, , and

Since , τ⃗=m→×B→\vec { \tau } = \overrightarrow { \mathrm { m } } \times \overrightarrow { \mathrm { B } }

[and ]