Q.

Thick and thin wires give rise to 3 different squares x, y and z as shown in figure. The magnetic field at the centre of

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a

x and z is zero

b

y and z is zero

c

x only is zero

d

x, y and z is zero

answer is C.

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Detailed Solution

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In y and z , the current distribution in upper and lower branch will be equal.

Magnetic field in y, z are equal and opposite at the center.

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