Home › NEET UG › Physics › Electromagnetic Induction › A coil of inductance 0.5 H carries a current cha…
A coil of inductance 0.5 H carries a current changing at 4 A s⁻¹. The induced EMF is:
A0.5 V
B1 V
C2 V
D8 V
Answer & Solution
Correct answer: C. 2 V
1. |EMF| = L · |dI/dt| = 0.5 × 4 = 2 V.
2. The minus sign indicates back-EMF direction (opposes the change).
_Source: NCERT Class 12 Physics Ch 6 §6.8 (back-EMF numerical)_
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 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:Mutual inductance M between two coils relates the EMF induced in coil 2 to the current in