engineering recuitment NPCIL Scientific Assistant Physics Mock Test Physics Moving Charges and Magnetism Magnetic Force on a Current-Carrying Wire
A current I is flowing in a circular coil of radius R. What will be the effect on the magnetic field at the centre of the coil if the radius of the circular coil is reduced to half?
1
Increase by 2 times
2
Decrease by 2 times
3
First, decrease then increase
4
First, increase then decrease