Home › UP Board Class 12 › physics › Electromagnetic Induction › A bar magnet pushed into a coil at rest causes t…
A bar magnet pushed into a coil at rest causes the galvanometer needle to kick because:
AThe coil resistance changes when a magnet is near it
BThe coil heats up and emits a thermal voltage on the bench
CChanging flux through the coil induces an EMF by Faraday's law
DThe magnet directly contacts the coil and transfers charge
Answer & Solution
Correct answer: C. Changing flux through the coil induces an EMF by Faraday's law
Faraday: changing flux $\Rightarrow$ induced EMF $\Rightarrow$ current $\Rightarrow$ galvanometer kick.
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: