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Q.

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
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