Electromagnetic induction in electrical engineering Electromagnetic induction is the physical process by which one form of energy creates the other when a magnetic field and an electric circuit interact. In standard terminology, electromagnetic induction is the generation of what quantity from what cause?

Introduction / Context:
Electromagnetic induction underpins generators, transformers, inductors, and many sensors. It explains how changing magnetic fields induce voltages and currents in conductors. Understanding the “from–to” relationship (what causes what) is foundational for both power and electronics domains.

Given Data / Assumptions:

• A conductor or coil is present.
• A magnetic field linked to that conductor changes with time (by motion or field variation).
• We consider idealized behavior (no saturation, negligible losses) to focus on the principle.

Concept / Approach:
Faraday’s law states the induced electromotive force in a coil is proportional to the negative rate of change of magnetic flux through it: e_induced = −N * dΦ/dt. In plain words, a changing magnetic field “through” a circuit produces (induces) an electrical voltage; if a closed path exists, current flows. Lenz’s law gives the polarity that opposes the change causing it. Therefore, electromagnetic induction is the generation of electricity (voltage/current) from magnetism (changing flux).

Step-by-Step Solution:

Verification / Alternative check:
Rotate a coil in a steady magnetic field: Φ varies sinusoidally with angle, creating a sinusoidal induced voltage. Alternatively, keep the coil still but vary the magnetic field (e.g., AC in a primary winding) and observe induced secondary voltage. Both confirm “electricity from magnetism.”

Why Other Options Are Wrong:

Common Pitfalls:
Confusing induction (changing flux → voltage) with the magnetic field created by current (current → magnetism). Also, assuming static magnetic fields induce voltage; it is the change (dΦ/dt) that matters.

Final Answer:
electricity, magnetism