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Two thick wir...

Question

Two thick wires and two thin wires, all of the same material and same length, form a square in three different ways P, Q and R as shown in figure. With correct connections shown, the magnetic field at the centre of the square is zero in case of.

A

P only

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B

P and Q only

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C

Q and R only

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D

P and R only

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Solution

The correct option is B P and R only
In P and R only, current divides equally in the two halves because of equal resistances in the two halves. The currents in the two halves then make the field at centre zero.

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