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Questions  

A current i ampere flows in a circular arc of wire whose radius is R, which subtend an angle 3π/2 radian at its centre. The magnetic induction B at the centre is

a
μ0iR
b
μ0i2R
c
2μ0iR
d
3μ0i8R

detailed solution

Correct option is D

B =   μ04π2π−θiR = μ04π   2π− π2 × iR =  3μ0i8R

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