I cant get this!!! ugh help A solenoid is wound with N=374 turns on a form D=4.5

Question

I cant get this!!! ugh help

A solenoid is wound with N=374 turns on a form D=4.5 cm in diameter and L=79 cm long. The windings carry a current in the sense that is shown. The current produces a magnetic field, of magnitude 6.2 mT, at the center of the solenoid. What is the value of the current in the solenoid windings? Express the answer with two decimal places. ( 0 = 1.2610-6 Tm/A).

I cant get this!!! ugh help A solenoid is wound with N=374 turns on a form D=4.5 cm in diameter and L=79 cm long. The windings carry a current in the sense that is shown. The current produces a magnetic field, of magnitude 6.2 mT, at the center of the solenoid. What is the value of the current in the solenoid windings? Express the answer with two decimal places. ( 0 = 1.26 10-6 T m/A).

Explanation / Answer

Magnetic field of a solenoid is

B=uo*N*I/L

=>I=B*L/uoN =(6.2*10-3)(0.79)/(1.26*10-6)*374

I=10.4 A

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