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?
1      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:

m
Largest value of x:
3      m (a) For what finite value of x is the electric field zero?
1      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:

m
Largest value of x:
3      m

Explanation / Answer

a) say r (between two charges) is the point on x axis where E is zero

=)kq/r^2 = k(2q)/(8.5-r)^2

=)r =3.53

b)say r (between two charges) is the point on x axis where V is zero

=)kq/r = k(2q)/(8.5-r)

=)r =2.83

c)say r ( not between two charges) is the point on x axis where E is zero

=)kq/r^2 = k(2q)/(8.5+r)^2

=)r =20.53

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