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Two thick wires and two thin wires, all ...

Two thick wires and two thin wires, all of same material and same length from a square in three different ways P,Q and R as shown in the figure. With correct connections shown, the magnetic field due to the current flow at the centre of the loop will be zero in case of

A

P and R only

B

P and Q only

C

P only

D

Q and R only.

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