The figure shows a closely wound coil on a square core of inside edge length l. The no. of turns per unit length of the coil is n. Each turn carries current i into the plane of paper and out of the plane of papers. ABCD is an Amperian loop enclosing an open surface in the plane of the paper. The current enclosed by the loop is

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The figure shows a closely wound coil on a square core of

inside edge length l. The no. of turns per unit length of the

coil is n. Each turn carries current i into the plane of paper

and out of the plane of papers. ABCD is an Amperian loop

enclosing an open surface in the plane of the paper. The

current enclosed by the loop is

Answer:d 

Since the total current going into the surface is equal to total current coming out of the surface, therefore current enclosed is zero