alleryIn a generator working on electromagnetic induction, a potential difference appears across a conductor whenever which quantity around it changes?
AThe air pressure
BThe room temperature
CThe magnetic field
DThe chemical bonds
Answer & Solution
Correct answer: C. The magnetic field
1. The principle states that a potential difference is generated when the magnetic field around a conductor changes.
2. This change happens either by rotating the magnet near a fixed conductor or by moving the conductor near a fixed magnet.
3. So the changing quantity is the magnetic field.
_Source: Balbharati (Maharashtra Board) Class 10 Science & Technology Part 2, Ch 5 "Towards Green Energy", p.56_
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