What is the capacitance of the two metal spheres

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Homework Statement


What is the capacitance of the two metal spheres shown in the figure ?

sphere one has 20nC of charge and the other has -20nC of charge. The change in voltage is 100V

Homework Equations


C=Q/(change in V)


The Attempt at a Solution


My question is how do yo determine what charge to put in for Q?
 

Answers and Replies

  • #2
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Homework Statement


What is the capacitance of the two metal spheres shown in the figure ?

sphere one has 20nC of charge and the other has -20nC of charge. The change in voltage is 100V

Homework Equations


C=Q/(change in V)


The Attempt at a Solution


My question is how do yo determine what charge to put in for Q?

It's given.
 
  • #3
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It's given.

but the thing is how would I know to use 20nC or -20nC? What if you had 2 charges that were something like -30nC and 20nC? How do you know what Q to choose?
 
  • #4
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but the thing is how would I know to use 20nC or -20nC? What if you had 2 charges that were something like -30nC and 20nC? How do you know what Q to choose?

you will never be given a problem like that. the charge when dealing with capacitance will be symmetric if two values are given or it will be singular(where such an ambiguity is impossible)
 
  • #5
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So i assume then that the answer here is just 2E-8/100 then
 
  • #6
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So i assume then that the answer here is just 2E-8/100 then

assumed correct.
 
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