What phenomenon explains how a changing magnetic field can induce electrical current?

What phenomenon explains how a changing magnetic field can induce electrical current?

• A. Magnetism
• B. Electromagnetic induction
• C. Gravity
• D. Static electricity

Answer: (B)

Electromagnetic induction is the process by which a changing magnetic field through a closed loop induces electric current. When the magnetic flux through a circuit changes—such as moving a magnet toward or away from a coil or rotating a magnet inside a coil—the charges in the wire are pushed, creating an electromotive force that drives current around the loop. The induced current acts to oppose the change in magnetic flux, a relationship captured by Lenz's Law, and its strength grows with faster changes in the magnetic field. This principle powers generators and transformers, where mechanical motion or changing fields produce electricity. By contrast, magnetism is just the field itself, gravity isn’t involved in creating currents, and static electricity involves charges at rest, not a changing magnetic environment.

Electromagnetic induction is the process by which a changing magnetic field through a closed loop induces electric current. When the magnetic flux through a circuit changes—such as moving a magnet toward or away from a coil or rotating a magnet inside a coil—the charges in the wire are pushed, creating an electromotive force that drives current around the loop. The induced current acts to oppose the change in magnetic flux, a relationship captured by Lenz's Law, and its strength grows with faster changes in the magnetic field. This principle powers generators and transformers, where mechanical motion or changing fields produce electricity. By contrast, magnetism is just the field itself, gravity isn’t involved in creating currents, and static electricity involves charges at rest, not a changing magnetic environment.