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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.
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