A solenoid is wound with 290 turns per centimeter. An outer layer of insulated w

Question

A solenoid is wound with 290 turns per centimeter. An outer layer of insulated wire with 200 turns per centimeter is wound over the solenoid's first layer of wire. When the solenoid is operating, the inner coil carries a current of 10 A and the outer coil carries a current of 15 A in the direction opposite to that of the current in the inner coil. What is the direction of the magnetic field at the center for this configuration?
downward
to the left
to the right
upward


What is the magnitude of the magnetic field at the center of the doubly wound solenoid?

Explanation / Answer

Looking at the solenoid from above, if the inner current isclockwise then the net B field at the center is UP.

if the inner current is counterclockwise, then the net B fieldis DOWN.

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I can't see your picture, so I have to describe it thisway...

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