Find the electric potential energy

  • #1
319
13

Homework Statement


viber_image.jpg


Homework Equations


##V= \frac {kq}{r}##
##V= \frac {U}{q}##

The Attempt at a Solution


##V= \frac {kq}{r}## = 9*109*-5*10-9 /0.1= -450 V
##U= \frac {V}{q}## = -450 * -2*10-9 = 900nJ
Is my answer correct ?
 

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Answers and Replies

  • #2
gneill
Mentor
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2,877

Homework Statement


View attachment 223345

Homework Equations


##V= \frac {kq}{r}##
##V= \frac {U}{q}##

The Attempt at a Solution


##V= \frac {kq}{r}## = 9*109*-5*10-9 /0.1= -450 V
##U= \frac {V}{q}## = -450 * -2*10-9 = 900nJ
Is my answer correct ?
Yes, but the form of your second relevant equation in your last line of calculations is not. Fortunately you did the actual calculation correctly anyways :smile:
 
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