alleryA galvanometer connected to a coil shows deflection only when:
AWire is thick
BFlux changes
CCoil is warm
DField is zero
Answer & Solution
Correct answer: B. Flux changes
1. A magnet held still beside the coil does nothing.
2. Deflection appears only during the motion.
3. So the flux through the coil must be changing.
4. The answer is flux changes.
_Source: syllabus Physics, Ch 6 'Electromagnetic Induction'_
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