Question

Which of the following defines electromagnetic induction:

• A. When the magnetic field associated with a coil changes, an induced electric current flows through the coil.
• B. Electric current induces magnetic field near the wire carrying current.
• C. Two permanent magnets exert force on each other.
• D. Electrolyte disintegrates into ions in a battery.

Answer 1

The correct option is A When the magnetic field associated with a coil changes, an induced electric current flows through the coil.

The magnetic field associated with a coil is the magnetic flux flowing normally to the surface area of the current-carrying coil. When it changes, an emf is produced opposing the cause. This is the principle of Electromagnetic induction.