What effect does increasing the speed of a bar magnet toward a coil have on the induced current?

What effect does increasing the speed of a bar magnet toward a coil have on the induced current?

• A. It decreases the current
• B. It has no effect on the current
• C. It increases the current
• D. It causes the current to alternate

Answer: (C)

Increasing the speed of a bar magnet toward a coil enhances the induced current due to a principle known as electromagnetic induction. According to Faraday's law of electromagnetic induction, the magnitude of the induced electromotive force (EMF) in a closed circuit is proportional to the rate of change of magnetic flux through the circuit. When the magnet moves faster toward the coil, the magnetic field in the coil changes more rapidly. This rapid change in magnetic flux induces a larger voltage (or EMF) across the coil, which in turn results in a greater current flowing through the coil, assuming the resistance remains constant. Thus, as the speed of the bar magnet increases, the induced current correspondingly increases, making the correct response the increase in current based on this fundamental principle of electromagnetism.

Increasing the speed of a bar magnet toward a coil enhances the induced current due to a principle known as electromagnetic induction. According to Faraday's law of electromagnetic induction, the magnitude of the induced electromotive force (EMF) in a closed circuit is proportional to the rate of change of magnetic flux through the circuit.

When the magnet moves faster toward the coil, the magnetic field in the coil changes more rapidly. This rapid change in magnetic flux induces a larger voltage (or EMF) across the coil, which in turn results in a greater current flowing through the coil, assuming the resistance remains constant.

Thus, as the speed of the bar magnet increases, the induced current correspondingly increases, making the correct response the increase in current based on this fundamental principle of electromagnetism.