A long solenoid of 50 cm length having 100 turns carries a current of 2.5 A. The magnetic field at the centre of the solenoid is: (μ_0=4 π × 10^-7 T…

A long solenoid of $\displaystyle 50$ cm length having $\displaystyle 100$ turns carries a current of $\displaystyle 2.5$ A. The magnetic field at the centre of the solenoid is : $$\left(\mu_0=4 \pi \times 10^{-7} \mathrm{~T} \mathrm{~m} \mathrm{~A}^{-1}\right) $$