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Unformatted text preview: , and (c) the short circuit current. 4. A very long solenoid of radius a , carrying N turns per unit length, is looped by a circuit with resistance R , as shown below: (a) If the current in the solenoid is increasing at a constant rate, dI dt = k (a constant) what current ﬂows in the circuit and which way (left or right) does it pass through the resistor? (b) If the current I in the solenoid is constant, but the solenoid is pulled completely out of the circuit loop and then reinserted in the opposite direction, what total charge passes through the resistor? 5. Cheng, P. 7-27. 6. Cheng, P. 8-3. 7. Cheng, P. 8-5....
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- Fall '08
- Electromagnet, Magnetic Field, long straight wire, hollow cylindrical magnet, uniform axial magnetization