Home › GUJCET › Physics › Electromagnetic Induction › The induced EMF in a coil due to changing curren…
The induced EMF in a coil due to changing current in itself is given by:
A$e = -L\,dI/dt$
B$e = +L\,dI/dt$
C$e = L/I$
D$e = L \cdot I$
Answer & Solution
Correct answer: A. $e = -L\,dI/dt$
Self-induced EMF: $e = -L\,dI/dt$. The minus sign (Lenz) means it opposes the change in current, hence the description of self-inductance as 'electrical inertia'.
Related questions
The coil of an AC generator connects to the outside circuit through:A coil is labelled 2 H. The H stands for the unit called the:A magnet dropped through an aluminium pipe, compared with a PVC pipe, takes:Some trains brake with electromagnets held above the rails. The braking feels:Cutting slots in the swinging copper plate makes it:A copper plate swings between the poles of a magnet and soon stops. The cause is:A loop moves while lying fully inside a uniform magnetic field. The induced current is:Where does the work you do pushing the magnet into the coil end up?