engineering recuitment NPCIL Scientific Assistant Physics Mock Test Physics Moving Charges and Magnetism Magnetic Force on a Current-Carrying Wire
A circular coil of radius R having N number of turns carries a steady current I. The magnetic induction at the centre of the coil is 0.1 tesla. If the number of turns is doubled and the radius is halved, which one of the following will be the correct value for the magnetic induction at the centre of the coil?
1
0.05 tesla
2
0.2 tesla
3
0.4 tesla
4
0.8 tesla