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Q.

A circular current carrying coil produced a magnetic field of induction 1μT and 27μT at a point P on axis and at the centre of a coil respectively. If the radius of the coil is 20cm then distance of ‘P’ from center of the coil is

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a

40(2)cm

b

20(2)cm

c

20cm

d

102cm

answer is B.

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Detailed Solution

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BA=B01+x2r23/2

1μT=27μT1+x2r23/2

1+x2r2=32⇒x = 402cm

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