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Two parallel wires carrying current I and 2I in the same direction, have magnetic field B at

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Two parallel wires carrying current I and 2I in the same direction, have magnetic field B at the mid point between them. If current 2I is switched off then magnetic field at the midpoint will be - 

(A) B 

(B) B/2 

(C) 4B 

(D) B/4

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Correct option (A) B

Explanation:

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