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Q.

Considering magnetic field along the axis of a circular loop of radius R, at what distance from the centre of the loop is the field one eighth of its value at the centre?

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a

4R

b

6R

c

3R

d

3R

answer is B.

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Detailed Solution

Baxs  =  μ0IR22R2+x23/2=μ0I2R  11+x2R23/2Bcentre=μ0I2R   Baxis=  Bcentre1+x2R23/2=Bcentre81+x2R23/2=8  x=3R

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