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Q.

The magnetic field due to a current canying circular loop of radius 3 cm at a point on the axis at a distance of 4 cm from the centre is 54 μT. What will be its value at the centre of the loop?

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a

250 μT

b

150 μT

c

125 μT

d

75 μT

answer is A.

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Detailed Solution

BcenterBaxis  =  1+x2r23/2  ⇒   Bcenter54 =  1+4323/2 = 12527Bcenter  =  250 μT
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