Faraday's Law states that the induced emf is proportional to Hide answers

the rate of change in the flux of the coil

the cross sectional area of the coil

Can you produce current in a wire with a magnet that is sitting still?

No; the magnetic field has to be changing to excite the electrons

Yes; having a magnet near a wire is enough to excite the electrons

No; magnets cannot create electricity

According to Lenz’s law, the current that is created by induced 𝑒. 𝑚. 𝑓 in the external circuit would generate a field __________________________,

that opposes the change that created it

which is always counterclockwise

similar to the change that created it

A coil spins in a magnetic field. Of the following which causes an increase in the induced EMF in the coil?

Removing the coil from the magnetic field

Keeping the flux at a constant rate

Decreasing the number of turns of wire in the coil

Voltage can be induced in a wire by

a. moving the wire near a magnet.

b. moving a magnet near the wire.

c. changing the current in a nearby wire.

What would happen if I move a bar magnet in and out of a coil of copper wire?

Electric current will flow through the wire

Electric current would disappear

It would produce a gravitational field

Which description best applies to Lenz's Law?

When a change in magnetic field occurs to a coil the direction of current goes in the in the other direction to this change.

An induced current occurs when a magnet passes through a tube.

The direction of an induced current is such to align with the change that created it.

A magnet is a tube is always slowed by its magnetic field.

A permanent magnet is quickly introduced into the center of an aluminum closed ring. With this ring ...

will be attracted to the magnet;

it will start to rotate about an axis passing through its center.

In a closed conductive circuit contained in an alternating magnetic field, an induction current arises, the magnetic field of which is directed ...

so as to counteract changes in the external magnetic field.

just like an external magnetic field;

perpendicular to the outer field;

The turn is contained in a magnetic field such that the lines of induction of the magnetic field are parallel to the plane of the turn. Which statement is correct?

There is no induction current in the coil.

An induction current flows clockwise;

The induction current in the coil flows counter-clockwise;

The induction current in the coil will occur when the magnetic field induction changes;

Invisible Forces Induction

Authored by Charles Martinez

Physics

12th Grade

NGSS covered

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30 questions

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MULTIPLE CHOICE QUESTION

2 mins • 1 pt

___ Law defines the magnetic field generated by a long straight wire

Lenz'

Faraday's

Ampere's

Tags

NGSS.HS-PS2-5

NGSS.HS-PS3-5

MULTIPLE CHOICE QUESTION

45 sec • 1 pt

___ Law says that the Induced current is proportional to the change of magnetic flux

Lenz'

Faraday's

Ampere's

Tags

NGSS.HS-PS2-5

MULTIPLE CHOICE QUESTION

30 sec • 1 pt

___ Law says that a current produced by an induced emf moves in a direction so that its magnetic field opposes the original change in flux

Lenz'

Faraday's

Ampere's

Tags

NGSS.HS-PS2-5

NGSS.HS-PS3-5

MULTIPLE CHOICE QUESTION

2 mins • 1 pt

If you wrap more coils around an electromagnet, it will become...

brighter

stronger

weaker

invisible

Tags

NGSS.HS-PS2-5

NGSS.HS-PS3-5

MULTIPLE CHOICE QUESTION

2 mins • 1 pt

Find the direction of the magnetic force.

Into the screen

Out of the screen

Right

Left

Tags

NGSS.HS-PS2-5

NGSS.HS-PS3-5

MULTIPLE CHOICE QUESTION

2 mins • 1 pt

Find the direction of the magnetic force.

Down

Into the screen

Out of the screen

Tags

NGSS.HS-PS2-5

NGSS.HS-PS3-5

MULTIPLE CHOICE QUESTION

30 sec • 1 pt

In 1831 who discovered electromagnetic induction?

Thomas Edison

Nikola Tesla

Michael Faraday

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Invisible Forces Induction

___ Law defines the magnetic field generated by a long straight wire

___ Law says that the Induced current is proportional to the change of magnetic flux

___ Law says that a current produced by an induced emf moves in a direction so that its magnetic field opposes the original change in flux

If you wrap more coils around an electromagnet, it will become...

Find the direction of the magnetic force.

Find the direction of the magnetic force.

In 1831 who discovered electromagnetic induction?

A 4.0 m long cord is lying perpendicular to Earth's magnetic field of 5.6X10-5 T. If the cord is carrying a current of 11.0 A, what magnetic force is acting on the cord?

Find the direction of the magnetic force.

Faraday's Law states that the induced emf is proportional to Hide answers

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A 4.0 m long cord is lying perpendicular to Earth's magnetic field of 5.6X10^-5 T. If the cord is carrying a current of 11.0 A, what magnetic force is acting on the cord?