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

Answer 1

The correct statement about the electromagnets is:

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

In general, the strength of an electromagnet's magnetic field (B) is directly proportional to the current (I) through the wire and the number of turns (N) of the wire around the core, according to the formula:

\[ B \propto N \cdot I \]

Since electromagnet B has a high-intensity current, it will produce a stronger magnetic field compared to electromagnet A, which has a low-intensity current, assuming they both have the same number of turns in the wire. Therefore, the last response is incorrect; they wouldn't have the same strength if the currents are different.