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Question: Field at the centre of a circular coil of radius r, through which a current I flows is...

Field at the centre of a circular coil of radius r, through which a current I flows is

A

Directly proportional to r

B

Inversely proportional to I

C

Directly proportional to I

D

Directly proportional to I2I ^ { 2 }

Answer

Directly proportional to I

Explanation

Solution

Field at the centre of a circular coil of radius rris

B=μoI2rB = \frac { \mu _ { o } I } { 2 r }