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Q.

The magnetic induction at O due to the given arrangement where the ring is of radius r is

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a

Zero

b

Outward

c

inward

d

sufficient informations are not given to find the magnetic induction at 0.

answer is C.

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Detailed Solution

Magnetic induction produced by the straight part of the conductor, B1=μoi2π(2r)=12πμoi2r Magnetic induction producted by the circular loop at its centre, B2=μoi2rNow B2 > B1 and B2 is inward and B1 is outward.Hence option (3) is correct.

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