Questions
A circular coil of radius R carries an electric current. The magnetic field due to the coil at a point on the axis of the coil located at a distance r from the centre of the coil, such that r >> R, varies as
detailed solution
Correct option is B
The magnetic field due to a circular coil of radius Rat a point on the axis of the coil located at a distance r from the centre of the coil,B=μ04π 2πiR2 R2+r23/2Given, r >> R then we have, after neglecting R,B=μ04π2πiR2r3Also area A= πR2B=μ02π Air3 ⇒ B ∝ 1r3Talk to our academic expert!
Similar Questions
The magnetic field at the centre of a circular current carrying coil of radius The magnetic field on its axis at a distance R from the centre is
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