Lab: Magnetic and Electric Fields Answers

Based on the trends you observed in the laboratory exercise, which objects would you expect to be attracted to a bar magnet? Check all that apply.a metal hammera wooden rulera plastic carthe metal frame of your chairthe paper in your notebookthe screws and nails that hold your desk together

A

a metal hammer

B

a wooden ruler

C

a plastic car

D

the metal frame of your chair

E

the paper in your notebook

F

the screws and nails that hold your desk together

2

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saw dustsifted flour✔ iron shavings

A

saw dust

B

sifted flour

C

✔ iron shavings

3

✔ compasselectronic balancegalvanometer

A

✔ compass

B

electronic balance

C

galvanometer

4

✔ galvanometerelectronic balancethermometer

A

✔ galvanometer

B

electronic balance

C

thermometer

5

The Earth has a magnetic field. If you were to use a bar magnet to represent the magnet causing the magnetic field, which representation would be correct?

A

[Image: The Earth is shown with curved lines marked by arr...]

B

[Image: The Earth is shown with curved lines marked by arr...]

C

[Image: The Earth is shown with curved lines marked by arr...]

6

yes✔ no

A

yes

B

✔ no

7

✔ They will attract each other.They will repel each other.There will be no effect.

A

✔ They will attract each other.

B

They will repel each other.

C

There will be no effect.

8

A✔ Bboth

A

B

✔ B

C

both

9

leftright✔ neither direction

A

left

B

right

C

✔ neither direction

10

Predict what would happen to the strength of the electromagnet in each situation.

Answers:

Using a battery with a higher voltage::stronger force of attraction

Wrapping the wire around the nail only three times::weaker force of attraction

Changing the direction of the current by reversing the battery connections::no change

Using a plastic stick in place of the iron nail::weaker force of attraction

Holding the nail vertically rather than horizontally::no change

11

Use the drop-down menus to complete the passage.

Answers:

A galvanometer detects by showing needle movement in . If the wires in this galvanometer are attached to the terminals of a battery, the compass needle will move and point to the wrapped coil of wire.:an electric current

A galvanometer detects by showing needle movement in . If the wires in this galvanometer are attached to the terminals of a battery, the compass needle will move and point to the wrapped coil of wire.:a magnetic field

A galvanometer detects by showing needle movement in . If the wires in this galvanometer are attached to the terminals of a battery, the compass needle will move and point to the wrapped coil of wire.:perpendicular

A galvanometer detects by showing needle movement in . If the wires in this galvanometer are attached to the terminals of a battery, the compass needle will move and point to the wrapped coil of wire.:opposite

A galvanometer detects by showing needle movement in . If the wires in this galvanometer are attached to the terminals of a battery, the compass needle will move and point to the wrapped coil of wire.:magnet

12

an electric current✔ a magnetic fielda vacuum

A

an electric current

B

✔ a magnetic field

C

a vacuum

13

parallel✔ perpendicularat a 45-degree angle

A

parallel

B

✔ perpendicular

C

at a 45-degree angle

14

same✔ oppositemagnetic north

A

same

B

✔ opposite

C

magnetic north

15

✔ magnetwindlight source

A

✔ magnet

B

wind

C

light source

16

Which statements are true about moving the compass around the wire? Check all that apply.

A

With no current, the compass needle will not move.

B

If the light bulb is on, the compass needle will move.

C

If the circuit is on, compass needle movement will indicate a dead battery.

D

If current is flowing, the compass needle will not move unless the compass is touching the wire.

E

Changing the battery terminals will change the current flow and the compass will point differently.

17

Predict what would happen to the strength of the electromagnet in each situation.

Answers:

Using a battery with a higher voltage::stronger force of attraction

Wrapping the wire around the nail only three times::weaker force of attraction

Changing the direction of the current by reversing the battery connections::no change

Using a plastic stick in place of the iron nail::weaker force of attraction

Holding the nail vertically rather than horizontally::no change

18

stronger force of attraction✔ weaker force of attractionno change

A

stronger force of attraction

B

✔ weaker force of attraction

C

no change

19

stronger force of attractionweaker force of attraction✔ no change

A

stronger force of attraction

B

weaker force of attraction

C

✔ no change

20

stronger force of attraction✔ weaker force of attractionno change

A

stronger force of attraction

B

✔ weaker force of attraction

C

no change

Lab: Magnetic and Electric Fields Answers

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