Title: Summative Assessment
Course: MNPCC Physics > Section: Electricity and Magnetism

This quiz will check to make sure that you have learned what you have needed to during this unit.

Q: In which type of circuit does the current through each resistor add up to the overall current in the circuit?
- In parallel only. (Correct.)
- In series only. (Opposite.)
- In series and parallel. (In series each component has the same current, they are not additive.)
- In neither type of circuit. (The currents are additive in parallel circuits.)
A: In parallel only.
If right: Your answer is correct.
If wrong: Your answer is incorrect.

Q: Two charged metal spheres experience an attractive force of 1 N when they are 2 m apart from each other.  How far away from each other will they need to be to experience a force of 4 N?
- 1 m (Correct)
- 0.5 m (You only need to be twice as close to have four times the force.)
- 4 m (That would decrease the force by 4.)
- 8 m (That would decrease the force by 16.)
A: 1 m
If right: Your answer is correct.
If wrong: Your answer is incorrect.

Q: A compass is set under a wire that is running in a North-South direction. What will happen to the the compass as the current through the wire is slowly increased in the direction indicated.  The compass is currently pointing in the direction of the Earth's magnetic field.
- The compass will gradually rotate counter-clockwise to a maximum of 90 degrees. (Correct.)
- The compass will continually rotate counter-clockwise to a maximum of 180 degrees. (Magnetic fields are always perpendicular to current flow.)
- The compass will gradually rotate clockwise to a maximum of 90 degrees. (Wrong direction.)
- The compass will continually rotate clockwise to a maximum of 180 degrees. (Wrong direction and magnetic fields are always perpendicular to current flow.)
A: The compass will gradually rotate counter-clockwise to a maximum of 90 degrees.
If right: Your answer is correct.
If wrong: Your answer is incorrect.

Q: Two unknown objects are brought near each other and they attract.  No matter which way they are brought up next to each other, they still attract.  What are the two unknown objects?
- One is a magnet and one is a magnetic material. (Correct.)
- Both are magnets. (Then they would repel some times.)
- Both are magnetic materials. (Then they would never attract.)
A: One is a magnet and one is a magnetic material.
If right: Your answer is correct.
If wrong: Your answer is incorrect.

Q: Two bulbs are hooked up to the same potential.  Bulb A has twice the resistance of bulb B.  How will the power output of the bulbs compare?
- Bulb A will have half the power. (Correct.)
- Bulb A will have twice the power. (It is an inverse relationship.)
- Bulb A will have four times less power. (It is not a squared relationship.)
- Bulb A will have four times more power. (Wrong direction and not a squared relationship.)
A: Bulb A will have half the power.
If right: Your answer is correct.
If wrong: Your answer is incorrect.

Q: In which type of circuit is the current always the same through every component?
- Series (Correct.)
- Parallel (As parallel circuits have multiple paths, this is rarely the case.)
- Open (There is no current in an open circuit.)
- Closed. (This is too broad of a term.)
A: Series
If right: Your answer is correct.
If wrong: Your answer is incorrect.

Q: What must be true of the electrons in magnetic materials (ferromagnetic)?
- It must have many unpaired electrons. (Correct.)
- It must have many paired electrons. (Unpaired electrons make items diamagnetic.)
- It must have more electrons that protons. (This affects the charge, not the magnetic properties.)
- It must have less electrons than protons. (This affects the charge, not the magnetic properties.)
A: It must have many unpaired electrons.
If right: Your answer is correct.
If wrong: Your answer is incorrect.

Q: In which of the following technologies is a conductor moved within a magnetic field to produce a current?
- Generator. (Correct.)
- Electric Motor. (Motors do the opposite.)
- Transformer. (In a transformer nothing is moved.)
A: Generator.
If right: Your answer is correct.
If wrong: Your answer is incorrect.

Q: What is the slope of a graph of current vs. voltage?
- Resistance. (Correct.)
- Power (Power is voltage times current.)
- Charge (There is no relationship to the actual amount of charge here.)
A: Resistance.
If right: Your answer is correct.
If wrong: Your answer is incorrect.

Q: Two light bulbs one 40 watt and one 60 watt when hooked up in parallel in 120 volt circuit.  Which will be brighter when hooked up and series with each other and why?
- The 40 watt bulb, it has higher resistance so a larger voltage drop. (Correct.)
- The 40 watt bulb, it has less resistance so a higher current. (A 40 watt bulb would have a higher resistance. And current is the same in series circuits.)
- The 60 watt bulb, it has higher resistance so a larger voltage drop. (The 60 watt bulb would have a lower resistance.)
- The 60 watt bulb, it has less resistance so a higher current. (This is why it is brighter in parallel, but in series the current is the same.)
A: The 40 watt bulb, it has higher resistance so a larger voltage drop.
If right: Your answer is correct.
If wrong: Your answer is incorrect.

Q: The conventional current is going through the coil of wire shown here in a clockwise direction.  Which way does the magnetic field of this coil of wire point?
- Away from you. (Correct)
- Towards you (Are you using the correct hand?)
- To the right. (It needs to be perpendicular to the coil.)
- To the left. (It needs to be perpendicular to the coil.)
A: Away from you.
If right: Your answer is correct.
If wrong: Your answer is incorrect.