SSC JE Electrical Engineering 2013 Paper

Question : 103 of 200

Marks: +1, -0

The emf induced in a coil is given by

e = - N{dϕ}/{dt}

where e is the emf imduced, N is the number of turns and dϕ is the instantaneous flux linkage with the coil in time dt.
The negative sign in the expression is due to

Hans Christian Oersted
Andre-Marie Ampere
Michale Faraday
Emil Lenz

Validate

Solution:

According to Cenz's law, the induced EMF sets up a current it such a direction so as to oppose the cause as producting it. Mathematics this expression is expressed in the negative sign. So, in Faraday's, the negative sign shows that the polarity of induced emf is such that it oppose any change in magnetic flux of coil emf

=- N{dϕ}/{dt}

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