9_Electromagnetic Induction

Open Ended

What is the meaning by electromagnetic induction?

Open Ended

Electromagnetic induction can be used in?

Open Ended

When the bar magnet stop moving, it shows .... reading on a voltm

Open Ended

What's factor affect electromagnetic induction?

Multiple Choice

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

• Lenz'
• Faraday's
• Ampere's

Multiple Choice

___ 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

Multiple Choice

13.2 If a magnet is pushed into a coil, voltage is induced across the coil. If the same magnet is pushed
into a coil with twice the number of loops,

• a. one-half as much voltage is induced.
• b. the same voltage is induced.
• c. twice as much voltage is induced.
• d. four times as much voltage is induced.

Multiple Choice

Electromagnetic induction is change in ___________________. 

• surface area
• magnetic poles
• magnetic flux

Multiple Choice

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

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

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

• No; magnets cannot create electricity

Multiple Choice

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.
• d. all of these

Multiple Choice

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

• Electric current would disappear 
• The magnet would explode 
• Electric current will flow through the wire
• It would produce a gravitational field

Multiple Choice

A magnet is moved in and out of a coil of wire connected to a high-resistance voltmeter. If the number of coils doubles, the induced voltage 

• quadruples
• doubles
• is the same
• halves

Multiple Choice

What happens to the galvanometer if the copper rod is moved upwards?

• No change

• Deflect to the right

• Deflect to the left

• Deflect to the right and left

Multiple Choice

Which activity will produce the highest current?

• Move the magnet bar into the coil while the coil remains stationery

• Move the coil into the magnet bar while the magnet remains stationery

• Move the coil and magnet towards each other

• Move the coil and magnet away from each other

Multiple Choice

Which action will increase the deflection of the galvanometer pointer?

• The magnetic pole is reversed

• The number of turns of coils is increased

• The coil is made from insulated wire

• The magnet is slowly pushed into the coil

Multiple Choice

The voltmeter is at 0 in this image. How would you manipulate the experiment to create electricity (measured in volts)?

• Flip the magnet around so the North pole is facing out
• Move the magnet back and forth
• Take the magnet out
• Add more coils around the paper cylinder

Multiple Choice

The production of electric current by a changing magnetic field is called ____________________________________.

• induced current

• electromotive force

• electromagnetic induction

• internal resistance

Multiple Choice

___________________rule can be used to determine the direction of the ___________ induced current produced.

• Fleming's Left Hand Rule

• Fleming's Right Hand Rule

• Right Hand Grip Rule

Multiple Choice

Which device uses slip rings?

• a cathode-ray tube

• a d.c. generator

• an a.c. generator

• a solenoid

Multiple Choice

No EMF is induced when?

• When the wire is not moving

• When the wire is parallel to magnetic field direction

• When no lines are cut by the wire

• all of the above

Multiple Choice

What type of current is being produced?

• Alternating

• Direct

Multiple Choice

In electromagnetic induction, what is being created?

• Magnetism

• Electrical energy

• Mechanical energy

• Chemical energy

Multiple Choice

When there is a change in the magnetic field in a closed loop of wire

• (a) a voltage is induced in the wire
• (b) current is made to flow in the loop of wire 
• (c) electromagnetic induction occurs
• (d) all of these

Multiple Choice

A generator is used to light a bulb.  Energy for lighting the bulb actually comes from a

• coil or wire
• mechanical intput to the generator
• magnet in the generator
• plug where the generator is connected to the wall