WorksheetsUnit 9 - Magnetism
Total questions: 20
Worksheet time: 10mins
The electric force between two charges is -20 N. This tells us that the force is ______.
attractive
repulsive
increasing
decreasing
Two charges are set a distance apart from each other. If we increase one charge's value by a factor of 4.7, and increase the distance between the charges by a factor of 3.2, by how much does the resulting electric force change?
(q1q2)/d2
1.47
0.46
0.68
0.14
Two charges are separated by certain distance. Which change would result in the greatest increase in electrical force?
Dividing the distance by 4
Tripling the distance
Doubling both charges
Halving both charges
Current and resistance have a(n) ____________ relationship
There's no relationship
proportional
direct
inverse
A series circuit is created with an equivalent resistance of 6 ohms, an unknown current, and a battery with a voltage of 18 V. There are 3 resistors in the circuit.
What is the magnitude of the voltage drop (electrical potential difference) of this circuit?
3 V
6 V
18 V
0 V
Timmy decides to remove the 3.0 ohm lightbulb from a flashlight, and replace it with a resistor with a magnitude of 0.05 ohms. The flashlight explodes, and Timmy dies. What happened?
Resistance was decreased, which caused current to be way too high
Resistance decreased, so the potential difference increased
Resistance decreased, so the amperage became too low
Resistance decreased, so the electrons had a much greater charge
A series circuit has a 20 V battery, and a total equivalent resistance of 5 ohms. What is the circuit's current?
I = V/R
100 A
25 A
5 A
4 A
Electrons are transferred to two objects, a metal pie plate and a balloon. Which is correct?
The electrons spread out evenly throughout the pie plate, but stay on the 'skin' of the balloon
The electrons spread out evenly throughout the balloon, but stay on the 'skin' of the pie plate
The electrons will join a sea of electrons in the pie plate, and be entirely rejected by the balloon
The electrons will join a sea of electrons in the balloon, and be entirely rejected by the pie plate
Multiple resistors are added to a series circuit. The current in the circuit will ...
increase
decrease
stay the same
needs more information
Multiple resistors are added in new branches to a parallel circuit. The current in the circuit will ...
increase
decrease
stay the same
need more information
As more resistors are added in series, the equivalent resistance of the circuit will _________, and if more resistors are added in new parallel branches, the equivalent resistance of the circuit will __________.
decrease, increase
increase, increase
increase, decrease
decrease, decrease
A string of lights has a bulb burn out, and now the whole string won't light up. Why?
It's wired in parallel
It's wired in series
It's wired incorrectly
It's wired in a complex circuit
Which is the symbol for a resistor?
Which is the symbol for a battery?
Which is the symbol for a lightbulb?
Which is the symbol for a switch?
How does an electric motor work?
Atomic energy is converted to electrical energy by causing wire to lose electrons
Electrical energy is converted into mechanical energy by turning loops of wire.
Chemical potential energy induces a current which causes a magnet to rotate within an electric field .
Photonic energy causes a magnet to become an isotope, converting EMR into mechanical energy.
How does a generator work?
Mechanical energy causes a wire to rotate in a magnetic field, creating a current
Electrical energy spins a magnet inside a wire, creating a current
Chemical potential energy causes a circuit to convert kinetic energy to electrical energy
Photonic energy causes electrons to be ejected from a metal
How does an electromagnet work?
Moving charges create a magnetic field
Moving magnetic fields create an electrical current
coils of wire wrapped around iron will cause electrons to fly out everywhere
An aluminum core wrapped in wire will experience magnetism
What kind of radiation allows electromagnetic force to be transmitted?
Light
Ionizing radiation
Thermal
3.6 Roentgen
