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2. A long solenoid has a diameter of 12.0 cm. When a current i exists in its
windings, a uniform magnetic field of magnitude B = 30.0 mT is produced in
its interior. By decreasing i, the field is cause to decrease at the rate of 6.50
mT/s. Calculate the magnitude of the induced electric field (a) 2.20 cm and
(b) 8.20 cm from the axis of the solenoid. (reference: problem 37, chapter 30,
fundamentals of physics)

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