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)
Responses
He should reduce the number of turns.
He should reduce the number of turns.
He should decrease the current through the wire.
He should decrease the current through the wire.
He should replace the iron nail with a plastic spoon.
He should replace the iron nail with a plastic spoon.
He should add another battery.
He should add another battery.
Which factors directly affect the magnetic force produced by an electromagnet?(1 point)
Responses
amount of current, type of force
amount of current, type of force
amount of current, length of core
amount of current, length of core
length of core, number of turns in the wire
length of core, number of turns in the wire
number of turns in the wire, amount of current
number of turns 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)
Responses
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 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 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 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.
What produces the magnetic force of an electromagnet?(1 point)
Responses
positive and negative charges repelling each other
positive and negative charges repelling each other
movement of charged particles through the wire
movement of charged particles through the wire
magnetic fields passing through the device
magnetic fields passing through the device
static charged particles on the wire
static charged particles on the wire