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1. [1pt]
A person scuffing her feet on a wool rug on a dry day accumulates a net charge of 
42.1uC. How many excess electrons does this person get?
Correct, computer gets: 2.63e+14
2. [1pt]
By how much does her mass increase?
Correct, computer gets: 2.40e16 kg
3. [1pt]
Three charges are arranged on a line as shown above.
(For each statement select T True, F False).
A) If Q
1
is positive, Q
2
is negative and Q
3
is negative, then Q
2
MUST feel a net force to the
right.
B) If Q
1
is positive, Q
2
is negative and Q
3
is positive, then Q
2
MUST feel a net force to the
right.
C) If Q
1
is negative, Q
2
is negative and Q
3
is positive, then Q
2
MUST feel a net force to the
right.
D) If Q
1
is positive, Q
2
is negative and Q
3
is positive, then Q
2
MIGHT feel a net force to
the right.
Correct, computer gets: FFTT
4.[1pt]
Two small spheres with charges 4 C and 9 C are held 9.5 m apart. Find the magnitude
of the force between them.
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View Full DocumentCorrect, computer gets: 3.59E+09 N
Hint:
This is an application of Coulomb's Law.
5.[1pt]
Four charges Aq,Bq,Cq, and Dq (q = 3.50 x 10
07
C) sit in a plane at the corners of a
square whose sides have length d = 63.0 cm, as shown in the diagram below. A charge,
Eq, is placed at the origin at the center of the square.
DATA: A = 4, B = 6, C = 3, D = 6, E = 4. Consider the charge at the center of the square.
What is the xcomponent of the net force on this charge?
Correct, computer gets: 1.57E02 N
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 Spring '08
 ROGERS
 Physics, Charge, Mass

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