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Home / Doubts and Solutions/NEET/Physics

A bar magnet is dropped so that it falls vertically through coil .the graph obtained for induced emf wiil be

Asked by ashutosharnold1998 18th September 2018, 10:38 PM
Answered by Expert
Answer:
induced emf e = - dφ/dt , where φ = magnetic flux = B×A, B is magnetic field and A is area of coil.
here Area of coil is constant. Hence e = -A×dB/dt.
 
when the bar magnet enters the coil, dB/dt is +ve, hence induced emf is -ve
when the bar magnet exit the coil, dB/dt is -ve, hence induced emf is +ve
Answered by Expert 19th September 2018, 12:03 AM
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