A 20 cm-long solenoid is constructed of 1700 turns of wire wrapped around a 2 cm

Question

A 20 cm-long solenoid is constructed of 1700 turns of wire wrapped around a 2 cm diameter core in the direction shown in the figure. A pickup coil composed of 210 turns of wire is wrapped tightly around the core at the middle of the solenoid in the opposite direction. The resistance of the pickup coil is R=3. The current through the solenoid is initially 0 and then increases to 14 A in 2 seconds.

a)When the current is 14 A (see figure for the direction) what is the magnitude of the magnetic field in the solenoid?

Explanation / Answer

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