A solenoid with 500 turns, 0. 10 mm long, carrying a current of 4. 0 A and with a radius of . 01m will have what strength magnetic field at its center? (magnetic permeability in empty space p = 4x X 10 T - m/A) .
a. 31 X 10- T
b. 62 X 10- T
c. 125 X 10- T
d. 250 X 10- T