. Four long straight wires are located at the corners of a square ABCD
All the wires carry equal currents. Current in the wires A and B are inwards and in C and D are outwards. The magnetic field at the centre O is along
A. AD
B. CB
C. AB
D. CD
Best Answer
Ans: A
Sol: Let magnetic field due to A, B, C and D be MA, MB, MC and MD respectively.
Then by the figure, resultant magnetic field M is towards AD.
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