A charge + q is at the origin. A charge -2 q is at x = 8.50 m on the + x axis. (

Question

A charge +q is at the origin. A charge -2q is at x = 8.50 m on the +x axis.   (a) For what finite value of x is the electric field zero?
m
(b) For what finite values of x is the electric potential zero? (Note: Assume a reference level of potential V = 0 at r = ?.)
Smallest value of x:
2 m
Largest value of x:
3. m (a) For what finite value of x is the electric field zero?
m
(b) For what finite values of x is the electric potential zero? (Note: Assume a reference level of potential V = 0 at r = ?.)
Smallest value of x:
2 m
Largest value of x:
3. m

Explanation / Answer

Let at a distant poetential is zero
q / a^2 = 2q / ( 8.5 - a)^2
solve for a value.

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