Examples
Question 1
Two point charges q_{1} and q_{2}are located with points having position vectors r_{1} and r_{2}
(1) Find the position vector r_{3} where the third charge q_{3} should be placed so that force acting on each of the three charges would be equal to zero.
(2) Find the amount of charge q_{3}
Question 2
Consider a thin wire ring of radius R and carrying uniform charge density λ per unit length.
(1) Find the magnitude of electric field strength on the axis of the ring as a function of distance x from its centre.
(2) What would be the form of electric field function for x>>R.
(3) Find the magnitude of maximum strength of electric field.
Question 3
Two equally charged metal balls each of mass m Kg are suspended from the same point by two insulated threads of length l m long. At equilibrium, as a result of mutual separation between balls, balls are separated by x m. Determine the charge on each ball.