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9/9/13 10:59 PMPRE-LAB 2: Electrostatics
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Current Score : 11 / 13 Due : Tuesday, September 10 2013 10:00
AM EDT
1. 4/4 points | Previous Answers
a) When the surface of a proof plan is placed against a
negatively charged object, the surface becomes
b) When the two surfaces of charge producers are rubbed
together, electrons are transferred so onebecomes positive and the
other becomes
c) In this experiment, we assume that the Earth acts as an
infinite source or acceptor of
d) Positively charged conductors that is grounded (attached to
the Earth) will
2. 3/3 points | Previous Answers
Remember: the outer cylinder of the Faraday pail is
grounded.
In porcedure 1: suppose a negative charge is placed inside (but
not touching) the inner cylinder of the
PRE-LAB 2: Electrostatics (Homework)David Korff- Physics 122/146
FALL 2013, section Tue 6:55 PM, Fall 2013Instructor: Ilmo Sung
WebAssign
negative
positive
neutral
negative
neutral
positive
positrons
electrons
push positrons to ground until it is neutral
pull electrons from ground until it is neutral
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9/9/13 10:59 PMPRE-LAB 2: Electrostatics
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Faraday pail.
a) The charge on the two surfaces of the outer cylinders are
b) The charge on the two surfaces of the inner cylinder are
c) The net charge on the entire Faraday pail is
positive on the outside, neutral on the inside
negative on both surfaces
negative on the outside, neutral on the inside
neutral on both surfaces
neutral on the outside, negative on the inside
positive on both surfaces
negative on the outside, positive on the inside
positive on the outside, negative on the inside
neutral on the outside, positive on the inside
negative on the outside, neutral on the inside
neutral on the outside, negative on the inside
negtative on the outside, positive on the inside
negative on both surfaces
positive on the outside, negative on the inside
neutral on both surfaces
neutral on the outside, positive on the inside
positive on the outside, neutral on the inside
positive on both surfaces
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9/9/13 10:59 PMPRE-LAB 2: Electrostatics
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3. 2/4 points | Previous Answers
In proceudre 5: you connect the plates to a 100 V difference in
potential (electrostatic voltage source).
a) First: you leave the plates connected to the electrostatic
voltage source and slowly separate theplates.
i. What will happen to V, the difference in potential between
the plates, and E, the magnitude of theelelctric field between the
plates?
ii. What will happen to Q, the charge on the plates, and C, the
capacitance of the system?
negative
positive
neutral
cannot be determined from the information given
both V and E remain the same
V remains the same, E decreases
V decreases, E remains the same
both V and E decrease
V remains the same, E increases
V decreases, E increases
V increases, E decreases
V increases, E remains the same
both V and E increase
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9/9/13 10:59 PMPRE-LAB 2: Electrostatics
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b) Now, suppose now you disconnect the electrostatic voltage
source and then slowly separate theplates.
i.What will happen to V, the difference in potential between the
plates, and E, the magnitude of theelelctric field between the
plates?
ii. What will happen to Q, the charge on the plates, and C, the
capacitance of the system?
both Q and C decrease
Q remains the same, C increases
both Q and C increase
Q remains the same, C decreases
Q increases, C remains the same
Q increases, C decreases
Q decreases, C increases
Q decreases, C remains the same
both Q and C remain the same
both V and E increase
both V and E remain the same
both V and E decrease
V remains the same, E increases
V decreases, E remains the same
V decreases, E increases
V increases, E remains the same
V increases, E decreases
V remains the same, E decreases
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9/9/13 10:59 PMPRE-LAB 2: Electrostatics
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In procedure 5, the distance the plates are separated, d, is 10
mm and the electrometer reading, Ve, is93.2 V. What is the voltage
across the plates (Vp), the original potential difference between
the plates ?Hint: See Appendix J. 693 V
4. 2/2 points | Previous Answers
Viewing Saved Work Revert to Last Response
both Q and C remain the same
Q decreases, C remains the same
Q increases, C decreases
Q increases, C remains the same
Q remains the same, C decreases
Q remains the same, C increases
both Q and C decrease
Q decreases, C increases
both Q and C increase
