Physics - Magnetism Question with Solution | TestHub

Given $N=1000$, $L=4\text{m}$, $I=4\text{A}$.

The number of turns per unit length is $n=\frac{N}{L}=\frac{1000}{4}=250{\text{m}}^{-1}$.

The magnetic intensity $H$ at the centre of a long solenoid is given by $H=nI$.

Substituting the given values:

$H=250\times 4=1000\text{A/m}=10^3\text{A/m}$.

Answer: $10^{+3}\text{A/m}$