NEET2022PhysicsMagnetic Effects of CurrentActual
A closely packed coil having 1000 turns has an average radius of 62.8 ~cm . If current carried by the wire of the coil is 1 ~A , the value of magnetic field produced at the centre of the coil will be (permeability of free space =4 10^7 H / m ) nearly:
Options
- A10⁻¹ ~T
- B10⁻² ~T
- C10^2 ~T
- D10⁻³ ~T
Correct answer
D. 10⁻³ ~T
Step-by-step solution
As, magnetic field at centre of coil, aligned B & = ₀ ~N i 2 R B & = 4 10⁻⁷ 1000 1 2 62.8 10⁻² & = 4 3.14 10⁻⁷ 10^3 2 62.8 10⁻² & =10⁻³ ~T aligned