Question

a -10nc point charge and a +20.0 nc point charge are 15.0 cm apart on the x axis?

a. what is the electric potential at the point on the x axis where the electric field is zero?

b. what is the magnitude of the electric field at the point on the x axis, between the charges, where the electric potential is zero?

Answer 1

a) U=k.Q1.Q2/r^2. =(9*10^9)(+20*10^-9)(-10*10^-9)/(0,15) = -1.2*10^-5 J

b) F=k*Q1*Q2/r^2

=(9*10^9)(20*10^-9)(10*10^-9)/(0,15)^2

=8*10^-5 N attractive force

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