Question

Unreasonable Results:

(a) Find the voltage near a 14.0 cm diameter metal sphere that has 7.60 C of excess positive charge on it.
(b) What is unreasonable about this result?
(c) Which assumptions are responsible?

Answer 1

V = K Q / R electric potential due to charge Q at distance R

V = 9.00E9 * 7.6 / .14 = 4.89E11 V

Almost 1 trillion volts due to large charge of 7.60 C

(Find Q needed to provide 100 amp-hour of charge on a 12V car battery)