A problem on Coulomb's Law

Four charged particles are placed on the vertices of a square. The charges are +Q+Q(depicted by green) and +q+q(depicted by blue). What should be Qq\frac{Q}{q} so that both the particles having charge +Q+Q experience net zero electrostatic force?

Please help me with this question. Thanks.

Swapnil

Note by Swapnil Das
3 years, 5 months ago

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1 vote

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  • Do you know the expression for Coulomb's law, which helps us find the electrostatic force between two point charges?

  • Have you tried drawing a free body diagram of the +Q charge?

Pranshu Gaba - 3 years, 5 months ago

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Oh yeah. I am stuck somewhere, in the calculations perhaps. Please help.

Swapnil Das - 3 years, 5 months ago

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Kindly share your progress with this problem. What forces did you get on the +Q charge?

Pranshu Gaba - 3 years, 5 months ago

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@Pranshu Gaba All. I simply applied Vector form of Coulomb's law and plugged values. I did that for both the +Q charges and tried to equate. Doesn't seem to give nice results.

Swapnil Das - 3 years, 5 months ago

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This can be easily done using physical form of Nash Equilibrium for charges.

Nitesh Chaudhary - 3 years, 5 months ago

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Wow! I have only encountered Nash Equilibrium in Game theory. I am interested to see how it can be applied in physics. Could you please elaborate on it? Thanks!

Pranshu Gaba - 3 years, 5 months ago

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Exactly! We would love to hear from him.

Swapnil Das - 3 years, 5 months ago

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Sounds really interesting. Can you show your work?

@Nitesh Chaudhary

Swapnil Das - 3 years, 5 months ago

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