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A magnet of magnetic moment 50 hat(i) A-...

A magnet of magnetic moment `50 hat(i) A-m^(2)` is placed along the x-axis in a magnetic field `vec(B)=(0.5hat(i)+3.0hat(j))T`. The torque acting on the magnet is

A

`175 hat(k) N- m`

B

`150 hat(k) N- m`

C

`75 hat(k) N- m`

D

`25 sqrt37 hat(k) N- m`

Text Solution

Verified by Experts

The correct Answer is:
B
`tau= vec(m) xx vec(B) = (50 hat(i)) xx (0.5 hat(i) + 3.0 hat(j)) = 25 xx 0 + 150 hat(k)= 150 hat(k) Nm`
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