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and 
are attracted by an electric force of 0.1 N. By how much are they spaced?
.
and 
are placed in a coordinate system. The coordinates of the first and second charges are 
and 
. respectively. Calculate the electric force between the charges.
.
. Another ball, which has the same charge quantity, is placed 10 cm below it. Calculate the force in the string.
and 
are placed 60 cm apart. Where between them must the third charge be in order for the resultant of the electric forces acting on it to be equal to 0?
. What is the charge quantity on each ball?
, 
, 
, 
lie at the vertices of a square of a side length 40 cm. Calculate the electric force acting on the charge 
.
