Depicts a two-turn horizontal coil in a uniform upward...

Depicts a two-turn horizontal coil in a uniform upward B-field. Assume the field is decreasing. (a) What is the direction of the induced magnetic field in the coil and why? (b) What is the direction of the induced current in the coil and why? (c) Which terminal is at a higher voltage? [Hint: Draw a diagram. Only concern yourself with what is happening inside the area of the coil. Study the previous three problems.]

Key Concepts

Electromagnetic Induction

This concept explains that when there is a change in the magnetic flux through a coil, an electromotive force (emf) is induced in the coil. Such a phenomenon is described by Faraday’s Law of Electromagnetic Induction, which quantifies how a time-varying magnetic field results in the generation of an induced voltage.

Lenz's Law

Lenz's Law states that the direction of the induced emf and current in a coil is such that the magnetic field created by the induced current opposes the change in the magnetic flux that produced it. This opposition ensures the conservation of energy and dictates the polarity and current direction in the coil when the original magnetic field is changing.

Right-Hand Rule

The right-hand rule is a practical tool used to determine the relationship between the direction of the applied magnetic field and the induced current. By orienting the thumb in the direction of the induced magnetic field, the curled fingers indicate the direction of the induced current in the coil, conveying how the current circulates to support the induced magnetic field.

Voltage Distribution in Circuits

When an induced current flows in a circuit such as a coil, differences in electric potential (voltage) emerge across the circuit’s terminals. The relative highs and lows of these voltages are determined by the direction of the induced current and the resulting magnetic forces, which affect the energy distribution within the circuit.

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