k = 8.988 * 10^9 ( N * m^2 / C^2) Use the tape measure to determine r, the dista

Question

k = 8.988 * 10^9 ( N * m^2 / C^2)

Use the tape measure to determine r, the distance between the charge and a point on any one of the four potential lines (circles) you just drew.
r = _0.195_ m
r = _0.298_ m
r = _0.35__ m
r = __0.43_ m

Calculate the potential using the formula V = k * q/r where k = 9 * 10^9,
q = -1nC = - 1 * 10^-9 and r is your reading from the tape measure.
q = -1nC = -1.00 * 10-9C
r = 0.195 m
k = 9.00*10^9 (N *m^2 / C2)
V = ?V
V = ?
V = ?
V = ?
Find the voltage in a point located at the given distance from the charge and com- pare it to the given voltage.
Solution: Calculate the potential using the formula V = k * q / r
V = (9.00 * 10^9 (N *m^2 /C^2))*(-1.00 * 10^-9C / 0.195m) =?V

Explanation / Answer

for r=0.195 m

potential will be

V=kq/r

V=9*10^9*(-1*10^-9)/0.195

V=-46.15V

for r = 0.298 m

V=9*10^9*(-1*10^-9)/0.298

=-30.2V

for r=0.35 m

V=9*10^9*(-1*10^-9)/0.35

=-25.71V

for r=0.43m

V=9*10^9*(-1*10^-9)/0.43

V=-20.9V

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