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Q.

A circular loop of radius R, carrying current I, lies in xy plane with its centre at origin. The total magnetic flux density at centre is 

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a

directly proportional to I2

b

directly proportional to R2

c

inversely proportional to R

d

zero

answer is C.

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Detailed Solution

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B=μ0I2R

B∝I , &, B∝1R

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A circular loop of radius R, carrying current I, lies in xy plane with its centre at origin. The total magnetic flux density at centre is