Acylindrical insulated wire of diameter 2.0 mm is tightly wound 200 times around a cylindrical core to form a solenoid with adjacent coils touching each other. when a 0.10 a current is sent through the wire, what is the magnitude of the magnetic field on the axis of the solenoid near its center?

Explanation:

We apply the Ampere's Law to the solenoid:

N= number of turns on the solenoid

L=solenoid length

u=relative permeability of air= 4*pi*10^-7 N/A^2

I=current

B=magnetic field

if the coils touching each other:

L=N*d

d=diameter coil

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