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  4. A solenoid of 1200 turns is wound uniformly in a single layer on a glass tube 2 m long and 0.2 m in diameter. The magnetic intensity at the center of the solenoid when a current of 2 A flows through it is:

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Q. A solenoid of $1200$ turns is wound uniformly in a single layer on a glass tube $2\, m$ long and $0.2\, m$ in diameter. The magnetic intensity at the center of the solenoid when a current of $2 A$ flows through it is:

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Solution:

Magnetic field at centre inside the solenoid is given by
$B =\mu_0 nI$
So magnetic intensity at centre
$H =\frac{ B }{\mu_0}= nI =\left(\frac{1200}{2}\right)(2) $
$ H =1.2 \times 10^3 Am ^{-1}$