Question

Two electromagnets are made with the same core and the same type of wire. Electromagnet A has a low-intensity current, and electromagnet B has a high-intensity current. Which statement about the electromagnets is correct?(1 point)
Responses

If they produce the same strength magnetic force, then they must have the same number of turns in the wire.
If they produce the same strength magnetic force, then they must have the same number of turns in the wire.

If they have the same number of turns in the wire, then electromagnet A has a stronger magnetic force.
If they have the same number of turns in the wire, then electromagnet A has a stronger magnetic force.

If they have the same number of turns in the wire, then they must have the same strength magnetic force.
If they have the same number of turns in the wire, then they must have the same strength magnetic force.

If they produce the same strength magnetic force, then electromagnet A has more turns in the wire.
If they produce the same strength magnetic force, then electromagnet A has more turns in the wire.

Answer 1

Correct answer: "If they produce the same strength magnetic force, then electromagnet A has more turns in the wire."

Reason: Magnetic strength of a solenoid core is proportional to the ampere‑turns (N·I). With A having lower current, it must have more turns (larger N) than B to give the same N·I and thus the same magnetic strength.