A solenoid of 1200 turns is wound uniformly in a single layer on a...

Given,

Number of turns per metre $n = \dfrac{1200}{2}$

$l = 2m, d = 0 . 2m\text{and}I = 2A$

Magnetic field at centre inside the solenoid is given by $B = {\mu}_{0}nI$, where, ${\mu}_{0}$ is the permeability constant.

Magnetic intensity is related to magnetic field by

$H = \dfrac{B}{{\mu}_{0}} = \dfrac{{\mu}_{0}nI}{{\mu}_{0}} = nI = \left(\dfrac{1200}{2}\right) ( 2 )$

$⇒ H = 1 . 2 \times {10}^{3}A{m}^{- 1}$