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A current l amperes flows through a loop...

A current l amperes flows through a loop abcdefgha along the edge of a cube of width l metres as shown in figure. One corner 'a' of the loop lies at origin.
Now if a uniform external magnetic field is `overset-B=B_(0)hatj` is switched on, then the unit vector in the direction of torque due to external magnetic field `overset(-B)` acting on the current carrying loop (abcdefgha) is

A

`hatk`

B

`-hati`

C

`(2hati-hatj)/(sqrt5)`

D

none of these

Text Solution

Verified by Experts

The correct Answer is:
D
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