The magnetic field at the centre of a circular coil of radius r carrying current I is B1 The - Physics - Moving Charges And Magnetism

Question

The magnetic field at the centre of a circular coil of radius r
carrying current I is B1 The field at the centre of another coil of
radius 2r carrying same current I is B2 The ratio B1/B2 is?

Dinesh Pandey · Accepted Answer

Dear Student,

Magnetic field at the centre of the circular coil is,B=μ0I2πrAccording to question,B1=μ0I2πrB2=μ0I2π2rNow, B1B2=μ0I2πrμ0I4πr=21

The magnetic field at the centre of a circular coil of radius r carrying current I is B1. The field at the centre of another coil of radius 2r carrying same current I is B2. The ratio B1/B2 is?