Two wires are wrapped over a wooden cylinder to form two co-axial loops carrying currents i1 and i2 . If i2 = 8i1 , the value of x for B = 0 at the origin O is
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a
7−1R
b
5R
c
3R
d
7R
answer is D.
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Detailed Solution
B1=B2 ⇒ μ04π 2πi1R2 R2+R23/2 =μ04π 2i2πR2 x2+R23/2Given i2 = 8i1Solve to get x= 7 R