An Al ring of radius 5 cm(r1) and resistance of 3x10^-4 OHM\'s is placed aroudn
ID: 2099522 • Letter: A
Question
An Al ring of radius 5 cm(r1) and resistance of 3x10^-4 OHM's is placed aroudn the top of a long air-cored Solendoid with 2000 turns per meter and a smaller radius of 3 cm(r2). The current in the solenoid starts at 0 and gets to 100 amps in 2 seconds. Assume that the magnetic field produced the by the solenoid over the area at the end of the solenoid is one-half as strong as the field at the center of the solenoid. Assuem that the solenoid produces a negligible field out the its cross-sectional area.
A Find the Flub through the ring when I=0, 50, 100
B Find the Average Voltage and Current Induced in the outer ring during the 2 seconds
Explanation / Answer
Clearly, this is a magnetic induction problem. We know that a current through the soleniod produces a magnetic ?eld, therefore a time-varying current creates a time-varying magnetic ?eld. This time-varying magnetic ?eld is felt by the aluminum ring, and by Faraday