A long solenoid of radius 1 mm has 100 turns per mm. If 1 A current flows in the solenoid, the magne

Question

A long solenoid of radius 1 mm has 100 turns per mm. If 1 A current flows in the solenoid, the magnetic field strength at the centre of the solenoid is\

Professor PC Thomas Classes · Answer

(b) : Here, number of turns in the solenoid,\ $n=100 / 1 \mathrm{~mm}=100 	imes 10^{3} / \mathrm{m}$\ Current in the solenoid, $I=1 \mathrm{~A}$\ Magnetic field strength at the centre of the solenoid, $$ \begin{gathered} B=\mu_{0} n I \ =4 \pi 	imes 10^{-7} 	imes 10^{5} 	imes 1=12.56 	imes 10^{-2} \mathrm{~T} \end{gathered} $$