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Electromagnetic Induction Answers

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An electric current is produced using a bar magnet and a solenoid.Which changes will cause a decrease in the electric current produced? Check all that apply.

using more wire loops in the solenoid

using fewer wire loops in the solenoid

using a stronger magnet

moving the solenoid instead of the magnet

moving the magnet more slowly

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The generation of a magnetic field by an electric current is .

Answer not available

The table lists information about four devices.Which lists the devices in order from greatest magnetic field strength to weakest?

W, X, Y, Z

W, Z, Y, X

X, Z, Y, W

X, Y, Z, W

When the north pole of a bar magnet is moved into a solenoid, the needle on a galvanometer attached to the solenoid moves to the left, indicating that a current is produced. The magnet is then pulled out at a faster speed.What will be the result?

a larger current in the same direction

a larger current in the opposite direction

a smaller current in the same direction

a smaller current in the opposite direction

A wire has a current that flows to the right.Which describes the magnetic field produced by the current?

straight lines along the wire to the right moving the same direction of the current

straight lines along the wire to the left moving the opposite direction of the current

circles around the wire that go in at the top of the screen and moves in a counterclockwise direction

circles around the wire that go in at the bottom of the screen and moves in a clockwise direction

Which change will cause an increase in the electric current produced through electromagnetic induction?

using more wire loops in the solenoid

using the opposite pole of the magnet

using a weaker magnet

moving the solenoid slower

Tonya is modeling the discovery of electromagnetic induction. Which procedure should she use?

moving a magnet into a coil of wire in a closed circuit

moving a magnet into a coil of wire in an open circuit

bringing a compass near a wire that has no electric current

bringing a compass near a wire that has an electric current

Which changes will cause an increase in the magnetic field of a solenoid? Check all that apply.

using more wire loops

using fewer wire loops

using a larger current

using a smaller current

increasing the spacing between loops

decreasing the spacing between loops

Eva makes a graphic organizer to compare electromagnets with solenoids.

has a magnetic field like a bar magnet

has a metal core

uses electromagnetic induction

uses an electric current

Which change would reverse the direction of the electric current generated through electromagnetic induction?

moving the magnet slower

using more loops of wire in the solenoid

using the opposite pole of the magnet

using a weaker magnet

A coil of wire that carries an electric current is a(n) .

Answer not available

Lionel explores electromagnetic induction using the procedure shown.1. Move the magnet quickly into the right end of a solenoid.2. Hold the magnet in the solenoid for 3 s.3. Move the solenoid slowly to the left away from the magnet.What should Lionel observe during his investigation?

A large current forms, drops to zero, then remains at zero.

A large current forms, drops to zero, then a smaller current forms in the opposite direction.

A large current forms, drops to zero, then a smaller current forms in the same direction.

A small current forms, drops to zero, then a larger current forms in the same direction.

Four compasses are placed around a wire, as shown.The wire is then connected to a battery so that a current flows down the wire.How will the compasses point once the current is flowing?

A long wire that is vertical and standing on a steel plate. There are 4 compasses surrounding it and all of the needles are pointing in the same direction, west.

A long wire that is vertical and standing on a steel plate. There are 4 compasses surrounding it and all of the needles are pointing in the same direction, east.

A long wire that is vertical and standing on a steel plate. There are 4 compasses surrounding it and all of the needles are pointing clockwise.

A long wire that is vertical and standing on a steel plate. There are 4 compasses surrounding it and all of the needles are pointing counterclockwise.

Joan makes the device shown in her science class.

The field would stop.

The field would get stronger.

The field would reverse its poles.

The field would get weaker.

Julia produces a 2 mA current by moving the south pole of a bar magnet into a solenoid. The solenoid contains 150 loops of wire.Which change should Julia make to generate a larger current?

moving the magnet slower

using more loops of wire in the coil

using the north pole of the magnet

setting the magnet down in the solenoid

Which will produce a magnetic field?

any wire with or without a current

a wire formed into a coil

a wire carrying a current

a wire formed into a single loop

Which describes Hans Oersted’s work with electricity and magnetism?

He discovered electromagnetic induction after seeing a compass needle deflected by a flowing electric current.

He discovered electromagnetism after seeing a compass needle deflected by a flowing electric current.

He discovered electromagnetic induction after seeing a changing magnetic field generate an electric current.

He discovered electromagnetism after seeing a changing magnetic field generate an electric current.