Two point charges, Q 1 = 3.5 ? C and Q 2 = -1.6 ? C ,are placed on the x axis. S

Question

Two point charges, Q1 = 3.5?C and Q2 = -1.6?C ,are placed on the x axis. Suppose that Q2 is placed at the origin, and Q1 is placed at the coordinatex1 = ? 5.0cm

A) At what point(s) along the x axis is the electric field zero? Determine the x-coordinate(s) of the point(s).

Express your answer using two significant figures. If there is more than one answer, enter your answers in ascending order separated by commas

B) At what point(s) along the x axis is the potential zero? Determine the x-coordinate(s) of the point(s).

Express your answer using two significant figures. If there is more than one answer, enter your answers in ascending order separated by commas

Explanation / Answer

Let the required point is at the Distance x from Q2

Therefore

kQ2/x^2 + kQ1/(0.05 - x)^2 = 0

-1.6/x^2 + 3.5/(0.05 - x)^2 = 0

x = -2 cm , 10.4 cm

=================================

Let the required point is at the Distance x from Q2

Therefore

kQ2/x + kQ1/(0.05 - x) = 0

-1.6/x + 3.5/(0.05 - x) = 0

x = - 1.56 cm

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