Question

Question 14
Using Coulomb's Law, if the distance between two charged objects is decreased, what happens to the electric force between them?



a
Electric force will increase
b
Electric force will decrease
c
Electric force is not affected by distance
d
Not enough information
Question 15
Maria makes an electromagnet shown in the figure below. The battery has a voltage of 6.0V, and she uses an iron nail. Which of the following would increase the strength of the magnetic field produced?



a
Replacing the iron nail with one made of plastic.
b
Doubling the number of times the wire wraps around the nail.
c
Changing the battery to a 3.0V battery.
d
Reversing the direction of the current flow.
Question 16
________________ is the amount of matter in an object while ______________________ is the force acting on the object due to gravity.

a
volume, mass
b
weight, mass
c
mass, weight
d
mass, volume
Question 17
Where is the force of attraction strongest on a magnet?

a
in the middle of the magnet
b
at the poles of the magnet
c
above the magnet
d
below the magnet
Question 18
Which of the following are ways to increase the strength of an electromagnet? (Select all the apply)

a
increase the number of loops
b
decrease the voltage of the battery
c
wrap the loops closer together
d
decrease the number of loops
e
make the loops spread out further
f
increase the voltage of the battery
Question 19
The image below shows a bar magnet.



Which of the following images correctly shows what the magnet would look like if it were broken into four pieces?

a


b


c


d


Question 20
The following orientation of magnets repel one another. True or False?



True
False
Question 21
Which of the following would NOT be observed in everyday life?

a
the south pole of a bar magnet repelling the south pole of a second bar magnet
b
the north pole of a bar magnet repelling iron filings
c
the north pole of a bar magnet attracting the south pole of a second bar magnet
d
the south pole of a bar magnet attracting iron filings
Question 22
Current flowing through a wire creates ...

a
electricity
b
static
c
a magnetic field
d
current
Question 23
Kinetic energy is calculated using the mass and ________________ of an object.

a
velocity
b
acceleration
c
position
d
gravity
Question 24
The following objects is magnetized.



True
False
Question 25
You have an iron core wrapped with wire. What else is needed to create an electromagnet?

a
energy
b
voltage
c
current
d
resistor
Question 26
Match the following word to its definition.

Column A
1.
magnetic field:
magnetic field
2.
electric force:
electric force
3.
attraction:
attraction
4.
repulsion:
repulsion
Column B
a.the electric or magnetic forces that acts between oppositely charged objects, causing them to be pulled together
b.the attractive or repulsive interaction between two charged particles
c.the electric or magnetic force that acts between like charged objects, causing them to push apart
d.the region around an object that exerts a force on other charged objects
Question 27
How does using a ramp make moving a refrigerator into an appliance truck easier?

a
It allows a larger force to be applied over a longer distance.
b
It allows a larger force to be applied over a shorter distance.
c
It allows a smaller force to be applied over a longer distance.
d
It allows a smaller force to be applied over a shorter distance.

Answer 1

Here are the answers (with brief reasoning). For questions that refer to images I can’t see, I note that and ask for the image.

14) a — Electric force will increase. (Coulomb’s law: F ∝ 1/r^2.)

15) b — Doubling the number of wraps increases the magnetic field strength.

16) c — mass, weight.

17) b — at the poles of the magnet.

18) a, c, f — increase number of loops; wrap the loops closer together; increase the battery voltage (which increases current).

19) — I can’t see the images. The correct physical result: each broken piece becomes a dipole (each piece has both a north and a south). Choose the picture that shows every piece with both N and S. If you upload or describe the options I’ll pick the letter.

20) — I can’t see the orientation picture. If the like poles face each other, then True (they repel); if opposite poles face each other, then False. Please upload/describe the image and I’ll answer.

21) b — the north pole of a bar magnet repelling iron filings (iron filings are attracted, not repelled).

22) c — a magnetic field.

23) a — velocity (KE = 1/2 m v^2).

24) — I can’t see the image. If the object shows aligned magnetic domains or labeled poles it’s magnetized; if not, it isn’t. Please upload the image and I’ll answer True/False.

25) c — current (you need current through the wire to produce the magnetic field).

26) Matches:
1 → d
2 → b
3 → a
4 → c

27) c — It allows a smaller force to be applied over a longer distance.