1) A loop carrying current / lies in the x-y plane as shown in the figure. The unit vector k is coming out of the plane of the paper. The magnetic moment of the current loop is A) a2Ik B) (π2+1)a2Ik C) −(π2+1)a2Ik D) (2π+1)a2Ik Answer: Option BExplanation:Area of the given loop is A=(area of two circles of radius a2 and area ofa square of side a ) =2π(a2)2+a2 =(π2+1)a2 |M|=IA=(π2+1)a2I From screw law direction of M is outwards or in positive z-direction ∴ M=(π2+1)a2Ik