Home › MHT-CET › 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
When a rod moves perpendicular to a magnetic field at constant velocity, the FREE charges An LC circuit oscillates with angular frequency ω equal to:Maxwell's correction to Ampère's law introduced:A bar magnet is dropped through a vertical conducting ring. The magnet:A coil of inductance 0.5 H carries a current changing at 4 A s⁻¹. The induced EMF is:A magnetic flux through a coil changes from 4 Wb to 1 Wb in 0.3 s. The average EMF inducedEddy currents are reduced in transformer cores by:A transformer works on the principle of: