What term describes a magnet that is produced by current in a coil with a ferromagnetic core?

What term describes a magnet that is produced by current in a coil with a ferromagnetic core?

• A. Electromagnet
• B. Permanent magnet
• C. Solenoid
• D. Inductor

Answer: (A)

An electromagnet is a magnet created by passing electric current through a coil; when that coil has a ferromagnetic core, the magnetic field becomes much stronger because the core has high magnetic permeability and concentrates the flux along its path. The field strength depends on the current and the number of turns, and it can be turned on or off by changing the current, which is why electromagnets are used in devices like relays and cranes. A coil by itself is just a solenoid; adding a ferromagnetic core turns it into an electromagnet capable of producing a controllable magnetic field. This differs from a permanent magnet, which relies on intrinsic magnetic order and does not require current, and from the broader ideas of inductors or bare coils that don’t focus on creating a controllable magnetic magnet.

An electromagnet is a magnet created by passing electric current through a coil; when that coil has a ferromagnetic core, the magnetic field becomes much stronger because the core has high magnetic permeability and concentrates the flux along its path. The field strength depends on the current and the number of turns, and it can be turned on or off by changing the current, which is why electromagnets are used in devices like relays and cranes. A coil by itself is just a solenoid; adding a ferromagnetic core turns it into an electromagnet capable of producing a controllable magnetic field. This differs from a permanent magnet, which relies on intrinsic magnetic order and does not require current, and from the broader ideas of inductors or bare coils that don’t focus on creating a controllable magnetic magnet.