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If a magnetic dipole of moment M situate...

If a magnetic dipole of moment M situated in the direction of a magnetic field B is rotated by `180^(@)` , then the amount of work done is

A

MB

B

2MB

C

`(MB)/(sqrt2)`

D

zero

Text Solution

Verified by Experts

The correct Answer is:
B
If the magnet be rotated from an initial orientation `theta _(1) = 0^(@)` to final orientation `theta _(2) = 180^(@),` the total work done
`W = int _(theta _(1)) ^( theta _(2)) MB sin d theta `
where B = magnetic field inducation
M= magnetic moment
`= MB (+ cos 0^(@) - cos 180^(@))`
`= MB [1+1] = 2 MB`
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