Induced EMF depends on coil turns and magnet speed

Steps:

• Faraday's law: Induced EMF ε = -N dΦ/dt, where N is turns, Φ is flux.
• Flux change rate dΦ/dt increases with magnet speed v, so steeper ramp (higher v) gives larger peak EMF and shorter duration.
• Fewer turns (smallest N) reduces peak EMF amplitude proportionally.
• Least turns + steepest ramp: Small-amplitude, narrow pulse graph.

Why C is correct:

• Matches ε ∝ N v: Low N limits height; high v narrows width while boosting height modestly, per flux linkage rate.

Why the others are wrong:

• A: Wide pulse indicates slow speed, not steep ramp.
• B: High amplitude suggests more turns, not least.
• D: Broad, tall pulse implies slow speed and many turns.

Final answer: C