In electromagnetic induction, the generated electricity is actually a voltage called

Analysis

The question asks for the specific term used to describe the voltage produced in a conductor when it is subjected to a changing magnetic field, a phenomenon governed by Faraday's Law of Electromagnetic Induction.

Concept Explanation

Electromagnetic induction occurs when a conductor (like a wire) is moved through a magnetic field, or when the magnetic field around a stationary conductor changes. According to Faraday’s Law, this change in magnetic flux induces an electromotive force (emf) in the conductor.

• emf (Electromotive Force): This is the energy per unit charge provided by a source (like a battery or an induction process) to drive current around a circuit. Even though it is called "force," it is measured in Volts, just like potential difference.
• Eddy Current: These are loops of electrical current induced within conductors by a changing magnetic field, but they are the result of the induced emf, not the voltage itself.
• Inductor Voltage: This usually refers to the potential difference across a component (an inductor) due to its own self-inductance, rather than the general phenomenon of induction.
• Watts: This is the unit of power, not voltage.

Step-by-Step Solution

1. Identify the phenomenon: The process of generating electricity via magnetic fields is Electromagnetic Induction.
2. Apply Faraday's Law: Faraday's Law states that the magnitude of the induced electromotive force (emf) in a circuit is directly proportional to the rate of change of the magnetic flux through the circuit.
3. Define the output: The "generated electricity" or "voltage" produced by this process is technically referred to as the Induced electromotive force (emf).
4. Evaluate the options: • A (Induced emf): This is the standard scientific term for the voltage generated by electromagnetic induction. • B (Eddy current): This is a current, not a voltage. • C (Inductor voltage): Too specific to a component; "Induced emf" is the broader, correct term for the phenomenon. • D (Watts): This is a unit of power.

Conclusion

The correct term for the voltage generated during electromagnetic induction is the Induced emf.

Exam Tip: Whenever you see "Electromagnetic Induction" in a question, always look for keywords like "Faraday," "Lenz's Law," "Magnetic Flux," or "Induced emf." These terms are almost always linked together in JAMB Physics questions.