Question

Which statements correctly describe the relationship between a solenoid and an electromagnet? Check all that apply.

A solenoid is an electromagnet.
A solenoid carries an electric current.
An electromagnet is a solenoid with a metal core.
An electromagnet induces an electric current in a solenoid.
A solenoid induces a magnetic field in a metal core.

Answer 1

Correct: A solenoid is an electromagnet; a solenoid carries an electric current; an electromagnet is a solenoid with a metal core; a solenoid induces a magnetic field in a metal core.

Wrong: An electromagnet induces an electric current in a solenoid.

Brief notes:
- A solenoid is a coil of wire that, when carrying current, produces a magnetic field — i.e. it functions as an electromagnet.
- A solenoid must carry current to make that magnetic field.
- An electromagnet commonly consists of a current-carrying solenoid wound around a ferromagnetic (metal) core to boost the field, though an electromagnet can also be an air‑core coil.
- A solenoid’s magnetic field magnetizes (induces a magnetic field in) a metal core placed inside it.
- An electromagnet only induces current in another coil (solenoid) if its magnetic flux through that coil is changing (Faraday’s law).