Answer to Question #309780 in General Chemistry for Mohammad Digermo

Question #309780

A point charge has a charge of 2.50 X 10-11 C. At what distance from the point


charge is the electric potential a) 90.0 V? b) 30.0 V? Take the potential to be


zero at an infinite distance from the charge.


Note: Show your free body diagram (FBD) and solutions accurately,


systematically and orderly with the standard unit, and express it into


prefix word if possible.

1
Expert's answer
2022-03-12T01:58:07-0500


Potential due to a point charge is given by kQr\frac{kQ}{r}

where k= 9×1099\times10^9

let's deduce a equation of V in terms of r :

V=9×109×2.5×1011rV=\frac{9\times10^9\times2.5\times10^{-11}}{r}


r=0.225Vr=\frac{0.225}{V}


a) when V = 90 volts

r=0.225/90=0.0025mr=0.225/90=0.0025m


b) when V = 30 volts

r=0.225/30=0.0075mr=0.225/30=0.0075m

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