Electromagnetic induction and rate of flux change

Steps:

• The ammeter reading indicates induced current from changing magnetic flux through the coil.
• Flux change depends on magnet speed, coil turns, and field strength.
• Original setup: slow magnet entry causes small positive current via Lenz's law opposing flux increase.
• To increase reading, increase rate of flux change without reversing direction.

Why C is correct:

• Faraday's law states induced EMF equals negative rate of flux change; faster speed increases dΦ/dt, boosting current magnitude.

Why the others are wrong:

• A: Opposite pole reverses flux direction, producing negative current and opposite reading.
• B: Pulling out decreases flux, inducing current in opposite direction for negative reading.
• D: Fewer turns reduce flux linkage, decreasing induced EMF and current.

Final answer: C