The long solenoid S shown (in cross section) in Fig. 30-3 has 220 turns/cm and carries a current i = 1.5 A;Â Â its diameter D is 3.2 cm. At its center we place a 130- turn closely packed coil C of diameter d = 2.1 cm. The current in the solenoid is reduced to zero at a steady rate in 25 ms. What is the magnitude of the emf that is induced in coil C while the current in the solenoid is changing?
Fig.30-3 A coil C is located inside a solenoid S, which carries current i.
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