MHT CET202124 Sep 2021Evening ShiftPhysicsMagnetic Effects of CurrentActual
A solenoid 2 ~m long and 4 ~cm in diameter has 4 layers of windings of 1000 turns each and carries a current of 5 ~A . what is the magnetic field at its centre along the axis? [ ₀=4 10⁻⁷ ~Wb / Am ]
Options
- A10⁻³ ~T
- B2 10⁻³ ~T
- C4 10⁻³ ~T
- D8 10⁻³ ~T
Correct answer
C. 4 10⁻³ ~T
Step-by-step solution
aligned & B = ₀ nI & n = N L = 4 1000 2 =2000 turns / m , I =5 ~A & B =4 10⁻⁷ 2000 5 & =4 10⁻³ ~T aligned