PHY102 Week 4 | Computational Physics in Physics - Grand canyon university
Week 4
assignment
Electricity and Magnetism Exercises PHY-102: Electricity and Magnetism Exercises Complete the following exercises.
1. Why are
good conductors of heat also good conductors of electricity?
2. What is
the difference between a good conductor and a good insulator?
3. Which of
the following are conductors? (Select all that apply)
A. Wood
B. Copper
C. Gold
D. Plastic
E. Distilled
water
4. Which of
the following are insulators? (Select all that apply)
A. Wood
B. Copper
C. Gold
D. Plastic
E. Distilled
water
5. A nail
contains trillions of electrons. Given that electrons repel from each other, why do they not then fly out of the nail?
6. How do
the number of electrons flowing into a light bulb compare to the number of electrons flowing out of it?
7. A light
bulb connected to a 9-V battery has a current of 1.5 A flowing. a. Find the resistance of the light bulb (in ohms) b. Find the power drawn by the light bulb (in W)
8. Consider
three identical light bulbs connected as shown in the circuit below. a. Which light bulb(s) will be brightest? Explain. b. What will happen to B and C if light bulb A is removed? Explain. c. What will happen to A and B if light bulb C is removed? Explain.
9. Rank the following
from smallest current to largest current.
A. A 1200W
microwave connected to 110V outlet.
B. A 1500W
water heater connected to 220V outlet.
C. A 100W
light bulb connected to 110V outlet.
D. A 2000W
oven connected to a 220V outlet.
E. A 40W
Light bulb connected to a 12V battery.
10. Your
friend says an appliance uses energy. How would you correct his statement?
11. Describe
the differences and similarities between an electromotor and a generator.
12. Your
friend with great excitement tells you about his newest idea to solve the energy crisis: He wants to use an electromotor to drive a generator and then use part of the electric power generated to power the electromotor while using the rest to power his home. What would you tell him?
13. Why is a
paper clip attracted to a magnet, while is pencil is not?
14. A loop of
wire embedded in the road at an intersection can be used to trigger a traffic signal. This is an application of magnetic induction. Explain.
The remaining questions are multiple-choice questions:
15. Two like
charges:
A. Attract
each other
B. Repel
each other
C. Must be
neutrons
D. Neutralize
each other
16. When a
plastic rod is rubbed with fur, the rod will become negatively charged. Which of the following best explains how this happens?
A. Electrons
are transferred from the plastic rod to the fur.
B. Electrons
are transferred from the fur to the plastic rod.
C. Negative
charges are created on the plastic rod.
D. Positive
charges are removed from the plastic rod.
17. What is
characteristic of a good insulator?
A. Electrons
are usually not moving at all.
B. Electrons
are free to move around.
C. Electrons
are semi-free to move around.
D. Electrons
are tightly bound to the nuclei.
18. In a solid
conductor such as a metal, what is the cause of an electric current?
A. A flow of
positive and negative charges.
B. A flow of
positive charges only.
C. A flow of
negative charges only.
D. A flow of
protons.
E. A flow of
neutrons.
19. How does
the resistance of a 100W light bulb compare to the resistance of a 60W light bulb?
A. The 100W
light bulb has a higher resistance than the 60W light bulb.
B. The 100W
light bulb has a lower resistance than the 60W light bulb.
C. The 100W
light bulb has the same resistance as the 60W light bulb.
D. Not
enough information to tell.
20. Consider
the five circuits in the diagram below. In which of the circuits will the light bulb light up?
21. What
causes an electric field?
A. A moving
change only.
B. A
stationary charge only.
C. Any
charge, moving or stationary.
D. A
stationary magnet.
22. What
causes a magnetic field?
A. A moving
change only.
B. A
stationary charge only.
C. Any
charge, moving or stationary.
23. What does
a step-up transformer do?
A. It steps
up the energy.
B. It steps
up the power.
C. It steps
up the voltage.
D. It steps
up the current.
24. Which of
the following is true for a generator?
A. It
transforms thermal energy to electrical energy.
B. It
transforms mechanical energy into electrical energy.
C. It
transforms electrical energy into mechanical energy.
D. It
transforms solar energy into electrical energy.
25. Which of
the following is true for an electromotor?
A. It
transforms thermal energy to electrical energy.
B. It
transforms mechanical energy into electrical energy.
C. It
transforms electrical energy into mechanical energy.
D. It
transforms electrical energy into potential energy.