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WorksheetsElectricity and Magnetism Test Review
Total questions: 48
Worksheet time: 58mins
In the Balloon Lab, why did the balloons move away from each other?
They both have positive charge.
They both have negative charge.
The have opposite charge.
How do we see unbalanced charges on clouds move?
Rain
Lightning
Thunder
Hail
Why does the charged balloon stick to the wall?
Gravity holds it there
The negative charge on the balloon pushes the positive charges away.
The negative charge on the balloon pushes the negative charges away.
How will the two balloons interact?
Attract
Repel
No interaction
True or False: Electrons are found at the center of an atom.
True
False
Which 2 variables affect the strength of electric force between 2 charged objects?
distance between the objects and the total amount of charge
distance and speed
the total amount of charge and speed
mass and speed
Which of the following can move from one atom to another?
protons
neutrons
electrons
the nucleus
Match the following circuit elements to their symbols.
battery
lamp
resistor
switch
ammeter
Since there are multiple pathways the current can take from the positive side of the battery to the negative side, in a (a) circuit, the (b) is divided up among the pathways, but the potential is the same for each pathway. In (c) circuits with only one pathway for the current, the (d) is divided up among the different elements.
Suppose light bulb and socket C was removed from the circuit shown. Wire is used to connect the switch to light bulb and socket B instead. What will happen to the total voltage of the battery when this happens?
It will stay the same.
It will increase so the bulbs A and B burn brighter.
It will decrease so the bulbs A and B will dim.
The circuit cannot work without light bulb and socket C where it is.
A potential difference of 24 V is applied to a 150-Ω resistor. How much current flows through the resistor?
0.15 A
3600 A
6.25 A
0.16 A
A 200-W light bulb is connected across a 100-V dc power supply. What current will flow through this bulb?
0.90 A
0.36 A
0.60 A
2.0 A
The current through the starter motor of a car is 210 A. If the battery maintains 12 V across the motor, how much J (Wsec) of electrical energy is delivered to the starter in 10.0 s?
2500 J
25200 J
17.5 J
175 J
To measure electric potential, use a (a) and attach it in (b) . To measure current, use a (c) and attach it in (d) ,
How many kilowatt-hours does a 550-W microwave use if it is run for 0.5 hr per day for 30 days?
8800 kW·hr
293 kW·hr
17600 kW·hr
8.8 kW·hr
0.293 kW·hr
Which of these is not an example of an electromagnet.
Refrigerator Magnet
Speakers
Computer Hard Drive
Generators
(Choose all that apply) Which of these would decrease the power of an electromagnet?
Decrease the distance to the power source.
Decrease the thickness of the wire.
Decrease the amount of current running through the wire.
Decrease the length of the wire.
(True of False) An electromagnet is still a magnet when there is not current running through it.
True
False
The strongest parts of the magnet are ...
fronts
backs
poles
middle
A magnet will pick up an object that is made of...
plastic
iron or steel
glass
copper
The area around a magnet is called the .....
attraction zone
work area
magnetic field
hot zone
Why does the compass needle move at different locations?
Because the needle is attracted to the magnetic field produced by the magnet
Because north is up
Because it is being attracted to the Magnetic North Pole
Because north is down
Every magnet has a:
East and West pole
North and South pole
East and South pole
North and West pole
Chicago and Saint pole
These magnetic domains are:
strongly magnetized
slightly magnetized
unmagnetized
To make this electromagnet stronger you could:
use less wire
have fewer wire coils around the nail
have more wire coils around the nail
use a plastic core
Which one represents the magnetic field lines of magnets repelling?
A
B
