MHT CET20192 May 2019Morning ShiftPhysicsMagnetic Effects of CurrentActual
The magnitude of magnetic induction at a point on the axis at a large distance r from the centre of circular coil of ‘ n ’ turns and area ‘ A ’ carrying current I is given by
Options
- AB a x i s = μ 0 4 π . n A I r 3
- BB a x i s = μ 0 4 π . 2 n I A r 3
- CB a x i s = μ 0 4 π . 2 n I A r 3
- DB a x i s = μ 0 4 π . n I A r 3
Correct answer
B. B a x i s = μ 0 4 π . 2 n I A r 3
Step-by-step solution
B a x i s = 2 μ 0 4 π M r 3 M = n i A ∴ B a x i s = 2 μ 0 4 π n i A r 3