mg
F
E
T
Tsin
θ
Tcos
θ
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.
Correct, computer gets: 3.59E+09 N
Hint:
This is an application of Coulomb's Law.
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View Full Document5.[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
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 Spring '08
 ROGERS
 Physics, Charge, Mass, Electric charge, Gravitational forces, net force

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