A wire is bent into a circular loop of radius and carries a steady current
PHYSICS · Single correct · CBSE · Physics · Moving Charges and Magnetism · Moving Charges and Magnetism
Problem
A wire is bent into a circular loop of radius r and carries a steady current I. If the radius is doubled without changing the current, how does the magnetic field at the centre of the loop change?
(a) It becomes one-fourth of its original value
(b) It becomes half of its original value
(c) It doubles
(d) It remains the same