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

Two thick wires and two thin wires, all of the same materais and same length from a square in the three differenct ways, `P,Q` and `R` as shwon in figure with current connection shown, the magneitc feidl at the centre of the square is zero in cases.

A

in P only

B

in P and Q only

C

in Q and R only

D

P and R only

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The correct Answer is:
D
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