KCET2025PhysicsMagnetic Effects of Current
A solenoid is 1 m long and 4 cm in diameter. It has five layers of windings of 1000 turns each and carries a current of 7 A . The magnetic field at the centre of the solenoid is
Options
- A0.4396 10⁻⁵ ~T
- B4.396 10⁻² ~T
- C43.96 10⁻² ~T
- D439.6 T
Correct answer
B. 4.396 10⁻² ~T
Step-by-step solution
=1 ~m ; r =2 ~cm ; N =5000 ; t =7 ~A ; 1 B = ₀ Ni aligned & B= 4 10⁻⁷ 5000 7 1 1 & B=4.396 10⁻² ~T aligned