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Four long wires each carrying current I as shown in the Fig. 21.118 are placed at the point A, B, C and D. Find the

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Four long wires each carrying current I as shown in the Fig. 21.118 are placed at the point A, B, C and D. Find the magnitude and direction of 

(i) Magnetic field at the center of the square.

(ii) Force per metre acting on wire at point D. 

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(i) BC = BA = BB = BD = B

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