railway RRB Technician Grade 1 Mock Test 2024 Physics Electromagnetic Induction and Inductance Faraday’s Law of Induction
A long solenoid is formed by winding 20 turns/cm. The current necessary to produce a magnetic field of 20 mili tesla inside solenoid will be approximately (μ0 = 4π × 10-7 T A-1m)
1
8.0 A
2
4.0 A
3
2.0 A
4
1.0 A