A student connects a battery to a wire and wraps the wire around an iron nail to produce an electromagnet. Which action should the student take to increase the number of paper clips the electromagnet can pick up? (1 point)

Question

He should replace the iron nail with a plastic spoon.

He should add another battery.

He should reduce the number of turns.

He should decrease the current through the wire.

Which factors directly affect the magnetic force produced by an electromagnet? (1 point)

length of core, number of tums in the wire

amount of current, length of core

amount of current, type of force

number of tums in the wire, amount of current

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)

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

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

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

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

What produces the magnetic force of an electromagnet? (1 point)

Static charged particles on the wire

Magnetic fields passing through the device

movement of charged particles through the wire

positive and negative charges repelling each other

Answer 1

1. To increase the number of paper clips the electromagnet can pick up, the student should add another battery. This increases the current flowing through the wire, which strengthens the magnetic field produced by the electromagnet.

2. The factors that directly affect the magnetic force produced by an electromagnet are the number of turns in the wire and the amount of current. Therefore, the correct answer is number of turns in the wire, amount of current.

3. Regarding the two electromagnets, the correct statement is: If they produce the same strength magnetic force, then electromagnet A has more turns in the wire. This is because, with a low-intensity current, the strength of the magnetic field can be compensated by having more turns of wire.

4. The magnetic force of an electromagnet is produced by the movement of charged particles through the wire. This movement creates a magnetic field around the wire.