Question:
The variation of induced emf (e) with time (t) in a coil if a
short bar magnet is moved along its axis with a constant
velocity is best represented as
The variation of induced emf (e) with time (t) in a coil if a
short bar magnet is moved along its axis with a constant
velocity is best represented as
Updated On: Jul 14, 2022
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The Correct Option is B
Solution and Explanation
Polarity of emf will be opposite in the two cases while
entering and while leaving the coil. Only in option
(b) polarity is changing. Hence, the correct option is (b).
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Concepts Used:
Faradays Laws of Induction
There are two laws, given by Faraday which explain the phenomena of electromagnetic induction:
Faraday's First Law:
Whenever a conductor is placed in a varying magnetic field, an emf is induced. If the conductor circuit is closed, a current is induced, known as the induced current.
Faraday's Second Law:
The Emf induced inside a coil is equal to the rate of change of associated magnetic flux.
This law can be mathematically written as:
∈\(-N {\triangle \phi \over \triangle t}\)
