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Why is the Q positive?

  • Thread starter flyingpig
  • Start date
  • #1
2,571
1

Homework Statement





[PLAIN]http://img256.imageshack.us/img256/9025/93408370.jpg [Broken]

The Attempt at a Solution



Shouldn't it be 2Q + x = -Q

x = -3Q?

My book say it is +Q
 
Last edited by a moderator:

Answers and Replies

  • #2
318
0
+Q is correct.
What would happen to the single electrons carrying the charge if you joined the two spheres by a conducting wire?
 
  • #3
2,571
1
+Q is correct.
What would happen to the single electrons carrying the charge if you joined the two spheres by a conducting wire?
Then why am I wrong? 2Q + x = -Q?
 
  • #4
gneill
Mentor
20,793
2,773
Don't you mean 2Q + (-Q) = x = +Q ???

After all, the total enclosed charge in a Gaussian surface surrounding both spheres would contain a net charge of +Q.
 

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