| 1. Calculate the net charge on a
material consisting of 2. What happen if two identical
charges are close together?
( e.g. "a" )
| a) attract each other |
b) repel each other |
| c) nothing happens. |
d) it depends on presense of
air. |
3. What is electric field lines for two proton and
one electron?
( e.g. "a" )
4. What would the mass of a proton be if the
gravitational and electric forces between a pair of
protons were the same?
( e.g. "1.00*10^-10 kg" )
5. There are two balls that weigh 50 g. Ball A is
fixed at a bar and the other ball B is underneath the
ball A. They have identical q but have opposite
charges. The ball B is 50 cm from ball A. What is the
charges of ball A and B
if ball B is at rest?
6. A small ball contains about 2.5*1030
protons and similar number of electrons. Suppose
there are two of these balls, and they are 10 m apart
and 0.2 % of the electrons on one ball is transferred
to the other. How much force is required to hold the
two balls apart at this distance?
7. There are two identical blocks and each one
weigh 500 g, but they have opposit charge. If the
coefficient static friction of block between floor is
0.30 and distance between two blocks is 70 cm. What
is the minimum charge that make the block move?
8. Which one of these has the highest potential
energy?
( e.g. "a" )
|