The magnetic intensity H at the centre of a long solenoid carrying a current of 2.0A, is found to be 1500A/m. Find the number of turns per centimetre of the solenoid.
B = μ0ni, H = B/μ0
=> H = ni
=> 1500 A/m = n× 2
=> n = 750turns/meter
=> n = 7.5turns/cm
