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Lesson 8.4 Electromagnetic Induction Answers

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

A
using more wire loops in the solenoid
B
using the opposite pole of the magnet
C
using a weaker magnet
D
moving the solenoid slower
2
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Joan makes the device shown in her science class.

Question illustration
A
The field would stop.
B
The field would get stronger.
C
The field would reverse its poles.
D
The field would get weaker.
4

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?

Question illustration
A
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.
Option A
B
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.
Option B
C
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.
Option C
D
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.
Option D
5

Craig is modeling the discovery of electromagnetism. Which procedure should he use?

A
moving a magnet into a coil of wire in a closed circuit
B
moving a magnet into a coil of wire in an open circuit
C
bringing a compass near a wire that has no electric current
D
bringing a compass near a wire that has an electric current
7

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

A
moving a magnet into a coil of wire in a closed circuit
B
moving a magnet into a coil of wire in an open circuit
C
bringing a compass near a wire that has no electric current
D
bringing a compass near a wire that has an electric current
8

Eva makes a graphic organizer to compare electromagnets with solenoids.

Question illustration
A
has a magnetic field like a bar magnet
B
has a metal core
C
uses electromagnetic induction
D
uses an electric current
9

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

A
straight lines along the wire to the right moving the same direction of the current
B
straight lines along the wire to the left moving the opposite direction of the current
C
circles around the wire that go in at the top of the screen and moves in a counterclockwise direction
D
circles around the wire that go in at the bottom of the screen and moves in a clockwise direction
10

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?

A
moving the magnet slower
B
using more loops of wire in the coil
C
using the north pole of the magnet
D
setting the magnet down in the solenoid
11

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Answer not available
12

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

A
using more wire loops
B
using fewer wire loops
C
using a larger current
D
using a smaller current
E
increasing the spacing between loops
F
decreasing the spacing between loops
13

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

Answer not available
14

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

Answer not available
15

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

A
He discovered electromagnetic induction after seeing a compass needle deflected by a flowing electric current.
B
He discovered electromagnetism after seeing a compass needle deflected by a flowing electric current.
C
He discovered electromagnetic induction after seeing a changing magnetic field generate an electric current.
D
He discovered electromagnetism after seeing a changing magnetic field generate an electric current.

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