PHY 101 Week 5 Individual Assignment Texbook Exercises
Chapter 22: 2/6
#2: Suppose that the changes attracting each other in the preceding problem have equal magnitude. Rearrange Coulomb’s law and show that the magnitude of each charge is 2.8x10^-6C (2.8 microcoulombs).
Chapter 23: 2/4
#2: The wattage marked on a light bulb is not an inherent property of the bulb, but depends on the voltage to which it is connected, usually 110 or 120v. How many amperes flow through a 60-w bulb connected in a 120-v circuit?
#4: Using the formula power=current x voltage, find the current drawn by a 1200-w toaster connected to 120 v. Then using the method from the previous problem, show that the resistance of the toaster is 12ohms
Chapter 24 Exercise 10, 18, 24
#10: What is different about the magnetic poles of common refrigerator magnets and those of common bar magnets
#18: What is the net magnetic force on a compass needle? By what mechanism does a compass needle align with a magnetic field
#24: Magnet A has twice the magnetic field strength of magnet B ( at equal distance) and , at a certain distance, it pulls on magnet B with a force of 50 N. With how much force then, does Magnet B pull on Magnet A?
Chapter 25: 2/4
#2: An ideal transformer has 50 turns in its primary and 250 turns in its secondary. 12 V ac is connected to the primary
#4: Neon signs require about 12,000 v for their operation. What should be the ratio of the number of loops in the secondary to the number of loops in primary for a neon-sign transformer that operates from 120-v lines?
Preview of solution:
Chapter 22: Electrostatics
8) When combing your hair, you scuff electrons from your hair onto the comb. Is your hair then positively or negatively charged? How about the comb?
Becomes positively charged hair, comb becomes negatively charged; Then, the electrons go comb your hair more electrons from a material as a negative.18) It is relatively easy to strip the outer electrons from a heavy atom like that of uranium (which then becomes a uranium ion), but it is very difficult to remove the inner electrons. Why do you suppose this is so?
Outer electrons are loosely connected to the core, because of the greater distance from the core, so that they can be easily removed. In the case of internal electrons, the opposite is true. It is more closely because their nearest the core, so that it is more difficult to remove them.
52) You are not harmed by contact with a charged metal ball, even though its voltage may be very high. Is the reason similar to why you are not harmed by the greater than 1000ºC sparks from a Fourth of July sparkler? Defend your answer in terms of the energies that are involved.
-Yes, The amount of energy involved is very small in both cases, the reason is because, similar.
Chapter 23: Electric Current
46) In the circuit shown, how do the brightnesses of the identical lightbulbs compare? Which bulb draws the most current? What will happen if Bulb A is unscrewed? If Bulb C is unscrewed?
Lamp brightness bulb A and B are the same, while the lamp is twice C or B C lamp bulb attracts more recent. When unscrewed A bulb, bulb C glow as it had not light bulb B. If C unscrewed bulb, bulb A and B. bulb shine with the same brightness.
Chapter 24: Magnetism
15) One way to make a compass is to stick a magnetized needle into a piece of cork and float it in a glass bowl full of water. The needle will align itself with the horizontal component of Earth’s magnetic field. Since the north pole of this compass is attracted northward, will the needle float toward the north side of the bowl? Defend your answer.
In the direction of the needle pointing toward the north; Injection of spare time to work on the remaining balance each other because, although it is not possible to move toward the north side.
43) In a mass spectrometer, ions are directed into a magnetic field, where they curve and strike a detector. If a variety of singly ionized atoms travel at the same speed through the magnetic field, would you expect them all to be deflected by the same amount, or would different ions be bent different amounts? Defend your answers.
- The deflection of ions by magnetic fields depends solely on their charge / mass. This is different for different ions.
Preview of solution:
Chapter 22: Electrostatics
8) When combing your hair, you scuff electrons from your hair onto the comb. Is your hair then positively or negatively charged? How about the comb?
Becomes positively charged hair, comb becomes negatively charged; Then, the electrons go comb your hair more electrons from a material as a negative.18) It is relatively easy to strip the outer electrons from a heavy atom like that of uranium (which then becomes a uranium ion), but it is very difficult to remove the inner electrons. Why do you suppose this is so?
Outer electrons are loosely connected to the core, because of the greater distance from the core, so that they can be easily removed. In the case of internal electrons, the opposite is true. It is more closely because their nearest the core, so that it is more difficult to remove them.
52) You are not harmed by contact with a charged metal ball, even though its voltage may be very high. Is the reason similar to why you are not harmed by the greater than 1000ºC sparks from a Fourth of July sparkler? Defend your answer in terms of the energies that are involved.
-Yes, The amount of energy involved is very small in both cases, the reason is because, similar.
Chapter 23: Electric Current
46) In the circuit shown, how do the brightnesses of the identical lightbulbs compare? Which bulb draws the most current? What will happen if Bulb A is unscrewed? If Bulb C is unscrewed?
Lamp brightness bulb A and B are the same, while the lamp is twice C or B C lamp bulb attracts more recent. When unscrewed A bulb, bulb C glow as it had not light bulb B. If C unscrewed bulb, bulb A and B. bulb shine with the same brightness.
Chapter 24: Magnetism
15) One way to make a compass is to stick a magnetized needle into a piece of cork and float it in a glass bowl full of water. The needle will align itself with the horizontal component of Earth’s magnetic field. Since the north pole of this compass is attracted northward, will the needle float toward the north side of the bowl? Defend your answer.
In the direction of the needle pointing toward the north; Injection of spare time to work on the remaining balance each other because, although it is not possible to move toward the north side.
43) In a mass spectrometer, ions are directed into a magnetic field, where they curve and strike a detector. If a variety of singly ionized atoms travel at the same speed through the magnetic field, would you expect them all to be deflected by the same amount, or would different ions be bent different amounts? Defend your answers.
- The deflection of ions by magnetic fields depends solely on their charge / mass. This is different for different ions.
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