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A solenoid has and across-sectional area . A small coil of turns is wound tightly around the center of the solenoid. If the current in the solenoid changes from to in , what is the induced EMF in the small coil?
- A.
- B.
- C.
- D.
Show correct answer & step-by-step solution
Correct answer: B —
Solution
The magnetic field is . The induced EMF is .
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