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1. When two spheres
repel each other, what are the charges of these two
(a) both positive (b) different charges (c)
alike (d) both negative
( e.g. "a" )
2. How will the force between two spheres change
if the distance between two sphere doubles?
(a) double (b) one half (c) quatriple (d) one
forth (e) same
( e.g. "a" )
3. There are two balls. Ball A has a charge of
+1.8 * 10-8 C and Ball
B has a charge of
+1.5 * 10-8 C and is
0.002 m away from A.
a. What is the force acting on A?
( e.g. "0.10 N" )
b.Do they attract or repel each other?
( e.g. "attract" or
4. Charged spheres A and B are fixed in position,
as shown, and have charges of +7.9 * 10-6
C and -2.3 * 10-6 C,
respectively. Calculate the net force on sphere C,
whose charge is +5.8 * 10-6 C.
( e.g. "1.00 N L" (L =
left and R = right))
5. Three identically charged spheres
A, B, and C, each with a charge of +3.0 * 10-7
C, are located at the corners of a triangle whose
sides are 30 cm long and all the angles are 60 deg.
What is the net force acting on sphere A?
( e.g. "1.0*10^-1" ) N upward
6. What is the mass of sphere X whose
charge is +1.70 * 10-7 C and
the distance between charged bar is 20 cm? The bar
has a charge of +2.30 * 10-6 C.
( e.g. "1.00*10^-1" ) kg