railway RRB Technician Grade 1 Mock Test 2024 Physics Electromagnetic Induction and Inductance Magnetic Flux
A solenoid of 1000 turns per metre has a core with relative permeability 500. Insulated windings of the solenoid carry an electric current. of 5 A. The magnetic flux density produced by the solenoid is : (permeability of free space = 4π × 10-7 H/m)
1
10-4π T
2
2 × 10-3π T
3
\(\frac{\pi}{5}T\)
4
π T