Two concentric coplanar circular loops of radii r 1 and r 2 carry currents of respectively i 1 and i 2 in opposite directions (one clockwise and the other anticlockwise.) The magnetic induction at the center of the loops is half that due to i 1 alone at the center. If r 2 = 2r 1 the value of i 2 / i 1 is
Text Solution
Verified by ExpertsThe correct answer is:
D
Magnetic field at center due to smaller loop
..... (i)
Due to Bigger loop 
So net magnetic field at center
According to question 
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