Physics - Magnetism Question with Solution | TestHub

Given $H=2.4\times 10^3\text{ A/m}$, $l=15\text{ cm}=0.15\text{ m}$, and $N=60$.

The magnetic field intensity $H$ inside a solenoid is given by $H=nI$, where $n$ is the number of turns per unit length.

$n=\frac{N}{l}=\frac{60}{0.15}=400\text{ turns/m}$

Substituting the values into the formula for $H$:

$2.4\times 10^3=400\times I$

$I=\frac{2400}{400}=6\text{ A}$

Answer: 6 A