Question

The magnetic intensity H at the centre of a long solenoid carrying a current of 2.0 A, is found to be 1500 A $m^{-1}$. Find the number of turns per centimetre of the solenoid.

Answer 1

Here B= ${\mu }_{0}ni$ H= $\frac{B}{{\mu }_0}$

Then H =ni

$\Rightarrow$ 1500 A/m = n $\times 2$

$\Rightarrow$ n = 750 turns/meter

$\Rightarrow$ n = 7.5 turns/cm