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One solenoid is centered inside another. The outer one has a length of 50.0 cm and...

  1. One solenoid is centered inside another. The outer one has a length of 50.0 cm and contains 5000 coils, while the coaxial inner solenoid is 4.00 cm long and 0.1000 cm in diameter and contains 20.0 coils. The current in the outer solenoid is changing at 40.0 A/s.
    1. What is the mutual inductance of these solenoids?
    2. Find the emf induced in the inner solenoid.
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