How large is B inside a long solenoid having 600 turns on it

How large is B inside a long solenoid having 600 turns on its 30-cm length if it carries a current of 5 A? Keep in mind that we are dealing with the MKS system.

Solution

According to the given question,

Magnetic field = permeability x turn density x current

B = ₀*N/L*I

B = 4 10^-7 *(600/0.3)*5

B = 1.25 * 10⁵T