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A current I amperes flows through a loop...

A current `I` amperes flows through a loop abcdefgha along the edge of cube of width `l` metres as shown in figure. One corner 'a' of the loop lies at origin.

The unit vector in the direction of magnetic field at the centre of cube abcdefgh of width `l` is given by

A

`hat(i)`

B

`- hat (j)`

C

`(2 hat(i)-hat(j))/(sqrt(5))`

D

`hat(k)`

Text Solution

Verified by Experts

The correct Answer is:
B
`["Moderate"]` The magnetic field at centre of cube ebode each carrying current I. T the magnetic field at centre of cube is only due to loop fabef. Hence the magnetic field at centre of cube is in negative y-direction.
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