PHY 109 Chapter Notes - Chapter HW 7: Electroscope

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whitesquirrel287

15 Apr 2018

School

University of Portland

Department

Physics

Course

PHY 109

Professor

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Document Summary

Hw 7 phy109 s18: se unit, activity 4. From the summarizing questions: we agreed the excess charge is generally on the surface rather than inside the body of an object. The evidence that shows that the excess charge is on the outside of the object is that it can be rubbed off or neutralized by a conductor like our hand. Electrons do move from object to object, but protons do not. So when making an uncharged particle positively charged (like the acrylic sheet touching the electroscope) the object getting charged (electroscope) has electrons leave making it more positive and transfer them to the already charged object (acrylic sheet). A conductor is something that can absorb both positive and negative charges neutralizing an object. An insulator is something that allows the positive and the negative charges to remain in the original object. Our example of this is when we charged an object that we were holding with our hand.

Related Questions

CHARGING BY INDUCTION:

Conductor A (positively charged) is brought nearby to conductor B(initially uncharged). We will use object A to charge object B byinduction.

In order to successfully charge object B, all of the following mustbe done:

a.) Which object needs to be connected to ground (at some time inthe process) in order for this to work?

Choose one answer:
1. A only
2. B only
3. Both A and B
4. Neither A or B
5. Not enough info

b.) During this connection, electrons will flow:
Choose one answer:
1. From A into the ground
2. From the ground into A
3. From B into the ground
4. From the ground into B
5. From A onto B
6. From B onto A
7. Not enough info

c.) When should B be disconnected to the ground?
Choose one answer:
1. Before A is taken away
2. After A is taken away
3. B will be charged the same way regardless
4. B does not need to be connected to ground at all
5. Not enough info

d.) If A is brought closer to B during this process (rather thanfurther away), then the amount of charge that can be generated on Bis:

Choose one answer:
1. Larger
2. Smaller
3. The same
4. Not enough info

e.) More generally, when charging an object by induction, theinitially uncharged object will always end up:

Choose one answer:
1. Negatively charged
2. Positively charged
3. With the opposite charge as the object used to charge it
4. With the same charge as the object used to charge it
5. There is no general statement that can be made about this

POTENTIAL MISHAPS:
f.) If, during an otherwise correct procedure, A were accidentallytouched to B while B is connected to the ground, then:

*The net charge on A would end up:
Choose one answer:
1. Positive
2. Negative
3. Zero
4. Not enough info

*The net charge on B would end up:
Choose one answer:
1. Positive
2. Negative
3. Zero
4. Not enough info

(Can you see why our attempt to charge B has failed?)

g.) If, during an otherwise correct procedure, B was disconnectedfrom ground only after A was taken far away, then:

*the net charge on A would end up:
Choose one answer:
1. Positive
2. Negative
3. Zero
4. Not enough info

*the net charge on B would end up:
Choose one answer:
1. Positive
2. Negative
3. Zero
4. Not enough info

(Can you see why our attempt to charge B has failed?)

PHY 109 Chapter Notes - Chapter HW 7: Electroscope

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