Electromagnetism 2

A current runs through a wire such that it generates a magnetic field. The magnetic field is in the clockwise direction in the plane of your computer screen. What is the direction of the current?

• into the screen

• out of the screen

• clockwise

• counterclockwise

A magnetic field and a current carrying wire are shown. Which direction is the current induced in the wire?

• into the screen

• out of the screen

• left

• right

A current carrying wire is placed in this magnetic field. Which direction is the current flowing?

• clockwise

• counterclockwise

• left

• right

A(n) ___ converts magnetism into electricity.

• electric transformer

• electric generator

• electromagnet

• electric motor

Why is permanent magnet able to exert a force on an electric charge?

• Electric charges have an electric field

• Electric charges have a magnetic field

• A permanent magnet has an electric field

• A permanent magnet cannot exert a force on an electric charge

What must occur for a magnetic field to induce an electric current?

• The magnetic field must be really big

• The magnetic field must be stable

• The magnetic field must be changing

• The magnetic field must be from a permanent magnet

A(n) ___ electric current will create a changing magnetic field.

• existing

• direct

• alternating

• stable

The ___ coils a wire has the ___ current is able to be generated.

• more; more

• less; more

• more; less

• less; less

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

How could the experimenter increase the amount of electricity being induced by this experiment?

• Increase the number of coils
• Decrease the number of coils
• Flip the magnet around
• Nothing, the amount of electricity cannot be increased