Question 1

Two students make electromagnets in Physics class. Farah's electromagnet has 20 loops in the coil. Willow's electromagnet has 50 loops in the coil. If they are both connected to 9-V batteries, which electromagnet will have a stronger magnetic field?

120

Both electromagnets will have the same strength.

Farah's electromagnet

Willow's electromagnet

Accepted Answer

Willow's electromagnet

Answer

Both electromagnets will have the same strength.

Answer

Farah's electromagnet

Question 2

How does the magnetic field around a current-carrying wire increase?

Accepted Answer

The current needs to increase to increase the magnetic field.

Answer

The current needs to decrease to increase the magnetic field.

Answer

The resistance of the wire needs to increase to increase the magnetic field.

Answer

The current needs to reverse direction to increase the magnetic field.

Question 3

If Yaseen were to replace the 12-V battery in his electromagnet with a 9-V battery, what would he notice when he tried to pick up some nails?

Accepted Answer

The magnetic field of the electromagnet would decrease, so it would pick up less nails.

Answer

The magnetic field of the electromagnet would increase, so it would pick up less nails.

Answer

The magnetic field of the electromagnet would increase, so it would pick up more nails.

Answer

The magnetic field of the electromagnet would decrease, so it would pick up more nails.

Question 4

Students in the lab do not have access to an ammeter. What else could they do to test whether current is flowing through a wire?

Accepted Answer

Use a compass to try and detect the magnetic field around the wire.

Answer

See if they get shocked when they touch the wire.

Answer

Touch a light bulb to the wire and see if it lights up.

Answer

See if a paperclip sticks to the wire.

Question 5

We can use the right-hand rule to determine the direction of the magnetic field around a current-carrying wire. Which statement is correct concerning magnetic field direction?

Accepted Answer

When the direction of the current reverses - the magnetic field will also reverse direction.

Answer

When the direction of the current reverses - the magnetic field will remain unaffected.

Answer

When the direction of the current reverses - the magnetic field will decrease.

Answer

When the direction of the current reverses - the magnetic field will increase.

Question 6

The smallest clusters of atoms with aligned electron spins are ________________; these will be _____________ in a permanent magnet.

Accepted Answer

domains: aligned in the same direction

Answer

poles: randomly oriented

Answer

domains: randomly oriented

Answer

poles: aligned in the same direction

Question 7

Below is a list of motor processes that explain its function. Place them in the correct order.

Question 8

What is the correct energy conversion for a motor?

Accepted Answer

Electrical to mechanical (kinetic) energy.

Answer

Magnetic to nuclear energy.

Answer

Mechanical to electrical energy.

Answer

Electrical to mechanical (potential) energy.

Question 9

What is the best explanation for the existence of magnetic fields?

Accepted Answer

Movement of electrical charges creates magnetic fields.

Answer

Iron is the only substance that has a magnetic field.

Answer

Gravitational fields create magnetic fields.

Answer

High voltage is the only way to create magnetic fields.

Question 10

Two magnets interact as seen in the image. Based on the magnetic field lines drawn - what poles are interacting?

Accepted Answer

North on the left and South on the right.

Answer

South on the left and South on the right.

Answer

North on the left and North on the right.

Answer

South on the left and North on the right.

Question 11

How can you create a current in a wire that is NOT attached to a battery or voltage source?

Accepted Answer

Loop it into a coil and push a magnet in and out of the loop.

Answer

Wave a magnet around next to it.

Answer

Loop it into a coil and rotate it around in the air.

Answer

Place a compass next to the wire.

Question 12

What is the energy conversion for a generator?

Accepted Answer

Mechanical (kinetic) to electrical energy

Answer

Electrical to magnetic energy.

Answer

Electrical to mechanical (kinetic) energy.

Answer

Mechanical (potential) to electrical energy.

Question 13

Below are the explanation for how a generator works. Place these statements in the correct order.

Question 14

Use the image to determine the direction of the magnetic field on the RIGHT SIDE of the wire.

Accepted Answer

Out of the screen

Answer

Answer

Answer

Into the screen

Question 15

Which of the properties listed below are only true for magnetic poles and not true for electric charges?

Accepted Answer

Cannot be separated from one another.

Answer

Opposites attract.

Answer

Likes repel.

Answer

Forces act over a distance and don't have to be in contact.

Question 16

Which of the coils in this Faraday Electromagnetic Induction demo would produce the greatest current if the magnet were moved the same way in each one?

Accepted Answer

The coil on the bottom with more loops will induce more current.

Answer

Both coils would induce the same current if the same magnet were used.

Answer

The coil on the top with less loops would induce more current.

Question 17

Two Physics students try to master the art of electromagnetic induction in a lab. Seamus moves his magnet in and out of the coil of wire 3 times every second. Gabe moves his magnet in and out of the coil of wire 2 times every second. What will the results be?

Accepted Answer

Seamus will see a brighter light bulb because he induced more current.

Answer

Gabriel will see a brighter light bulb because he induced more current

Answer

They will both see the same brightness bulb because the speed of the magnet does not effect induced current.

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