Two charges 4μC and +16μC are separated by a distance of 1m apart. Locate the point on the line joining of the two charges where the electric field is zero?
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Two charges  and  are located 16 cm apart. At what point(s) on the line joining the two charges is the electric potential zero? Take the potential at infinity to be zero.
Ans: There are two charges,


Distance between the two charges, d = 16 cm = 0.16 m
Consider a point P on the line joining the two charges, as shown in the given figure.

r = Distance of point P from charge q1
Let the electric potential (V) at point P be zero.
Potential at point P is the sum of potentials caused by charges q1 and q2 respectively.

Where,
 = Permittivity of free space
For V = 0, equation (i) reduces to
Explanation:
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