A circular coil of 50 turns, each of radius 4 cm carries an unknown current. Due to this a magnetic field of magnitude 4 × 10-4 T is produced at the centre of the coil. Find the approximate value of the unknown current. (Given : value of μ₀ = 4π × 10-7 TmA-1)
1
0.5 A
2
0.4 A
3
4 A
4
3.14 A