Question

Review Part A A 13.5 nC charge is at x 0cm and a -1.2 nC charge is at 7 cm At what point or points on the z-axis is the electric potential zero? Express your answcr using two significant figurcs. If thcrc is morc than onc answcr, give cach answer scparated by a comma. cm Submit Rcqucst Answer

Answer 1

Let at distance X from charge 13.5nC potential is zero

At point X

k X 13.5 x10^-9 /X = k X 1.2x10^-9/0.07- X

13.5/X= 1.2/0.07- X

1.2X + 13.5X = 0.945

14.7 X = 0.945

X = 6.4 cm

New radius R

2 × 4/3 pi X r^3 = 4/3 pi X R^3

2^1/3×r= R

V= kq/r = 260

r= 9×10^9 × 0.12× 10^-9/260= 0.42cm= 0.0042m

V = kq/r = 9× 10^9 × 2 × 0.12×10^-9/ 0.0042^1/3 = 2.16 / 0.16= 13.5V