A loop carrying current I lies in the x...

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 the paper . The magnetic moment of the current loop is

`a^(2)IhatK`

`((pi)/(2)+1)a^(2)IhatK`

`-((pi)/(2)+1)a^(2)IhatK`

`(2pi+1)a^(2)IhatK`

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