ABCD is a square loop made of a uniform conducting wire. A current ent

1.	ABCD is a square loop made of a uniform conducting wire. A current enters the loop at A and leaves at D. The magnetic field is (a) zero only at the centre of the loop (b) maximum at the centre of the loop (c) zero at all points outside the loop (d) zero at all points inside the loop
Answer» Correct Answer is: (a) zero only at the centre of the loop The resistance of AD is one-third of the resistance along the parallel path AB + BC + CD. Hence if current i enters at A, 3i/4 will flow along AD and i/4, along AB. The magnetic field at the centre due to AD is equal and opposite to the combined effects of AB, BC and CD.

ABCD is a square loop made of a uniform conducting wire. A current enters the loop at A and leaves at D. The magnetic field is (a) zero only at the centre of the loop (b) maximum at the centre of the loop (c) zero at all points outside the loop (d) zero at all points inside the loop

Answer»

Correct Answer is: (a) zero only at the centre of the loop

The resistance of AD is one-third of the resistance along the parallel path AB + BC + CD. Hence if current i enters at A, 3i/4 will flow along AD and i/4, along AB. The magnetic field at the centre due to AD is equal and opposite to the combined effects of AB, BC and CD.

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ABCD is a square loop made of a uniform conducting wire. A current enters the loop at A and leaves at D. The magnetic field is (a) zero only at the centre of the loop (b) maximum at the centre of the loop (c) zero at all points outside the loop (d) zero at all points inside the loop

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