Q .     A loop carrying current I lies in the `x-y` plane as shown in the figure. The unit vector `hat(k)` is coming out of the plane of paper. The magnetic moment of the current loop is

JEE 2012
A

`a^2Ihat(k)`

B

`(pi/2+1)a^2Ihat(k)`

C

` -(pi/2+1)a^2Ihat(k)`

D

`(2pi+1)a^2Ihat(k)`

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