1-5 chapters physics

The area of magnetic force around a magnet is known as its

• magnetic field

• magnet

• magnetic fan lines

• magnetic area

Permanent Magnets and Electromagnets are similar in which TWO ways?

• it can be turned off and on

• they both have a north and south pole

• they are surrounded by a magnetic field

What THREE ways are electromagnets different from permanent magnets?

• they can be turned off and on

• they can increase in strength by increasing the current in the wire

• they are smaller in size

• they can change which is the north and south pole

The electromagnetic forces from a current carrying wire are strong enough to move the compass needle. The forces can be made stronger by

• making the wire shorter

• making the wire longer

• making the wire into loops

What kind of charge is this?

• Positive charge

• Negative charge

• Neutral charge

Are the magnetic field lines in the picture correct?

• Yes, because they point from north to south.

• No, because they point from north to south (they're supposed to go the other way).

• Yes, because the North pole is on the left in all pictures.

• No, because the North pole is on the left in all pictures (it's supposed to be on the right).

True or False: An object can carry a positive, negative or neutral charge.

• True

• False

1) A bar magnet is at rest, next to a fixed electromagnet. In which direction will the bar magnet move when switch S is closed?

• to the left

• to the right

• up the page

• down the page

Why does an astronaut weigh less on the moon than on Earth?

• The astronaut has less mass on the moon.

• The astronaut is farther from Earth’s center when he or she is on the moon.

• The gravitational field strength is less on the moon’s surface than on Earth’s surface.

• The astronaut is continually in free fall because the moon orbits Earth.

Consider the electric field lines shown in the diagram below. From the diagram, it is apparent that object A is ____ and object B is ____.

• +,+
• +,-
• -,+
• -,-