A circular loop carries a current and produces a magnetic field at its centre

PHYSICS · Single correct · CBSE · Physics · Moving Charges and Magnetism · Moving Charges and Magnetism

Problem

A circular loop carries a current

I

and produces a magnetic field

B

at its centre. If both the current and the radius of the loop are doubled, what will be the new magnetic field at the centre? (a)

2B

(b)

B

(c)

\dfrac{B}{2}

(d)

\dfrac{B}{4}