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Maximum Potential and Charge of Generator

  • Thread starter 123yt
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  • #1
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Homework Statement


A Van de Graaff generator is used to demonstrate the effects of high potential. The device has a radius of 86.0 cm and stands in air. What is its maximum potential? (Note: An electric field of 3 × 106 Vm is sufficiently large to cause sparking in air.)

How much charge does the dome hold at its maximum potential?


Homework Equations


Electric Potential = (1/4*pi*e0) * q / r


The Attempt at a Solution


I already found the maximum potential to be 2.58 * 10^6 V.

For the charge: I substituted 2.58 * 10^6 V into the equation along with the radius.

2.58 * 10^6 V * 4 * pi * e0 * 0.86 m = q
q = 0.000247 C

This wasn't the correct answer.
 

Answers and Replies

  • #2
1,384
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I too got the same answer. The answer given might be wrong. What's it anyways?
 
  • #3
32
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I don't know yet. I have about 3 more tries left.

I entered the answer as 0.00025. Could the problem be with my significant figures?

EDIT: Nope, significant figures aren't the problem. 2 tries left.
 
Last edited:
  • #4
1,384
0
lol..... where are you trying them?
Try to answer in scientific notation.
 
  • #5
32
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I did. It still won't work. I probably got the completely wrong answer.
 
  • #6
1,384
0
Your answer is right according to me. I have no idea why it is showing wrong.
 

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