Question

Co-ordinates of four corners of a square loop are A ≡ (0, 0, 0), B ≡ (0, 0, a), C ≡ (a/√2, a/√2, a) and D ≡ (a/√2, a/√2, 0). A current I is flowing in the loop in ABCDA direction. The magnetic moment of the loop will be

Answer 1

Correct option: (b)

Explanation: 

Area of square loop is a² 

Magnetic moment is Ia² 

Which is perpendicular to plane of square loop