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anonymous

  • 5 years ago

Can anybody help me out here, or guide me where to start? In the image, the net electrostatic force in Qa is equal to 0, if Qa = +1.00 nC, what is the magnitude of Q0

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  1. anonymous
    • 5 years ago
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    |dw:1326996252832:dw|

  2. JamesJ
    • 5 years ago
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    Find the force acting on Qa from each of the other three charges, using Coloumb's law. Sum them up and set it equal to zero. This will enable you to find Q_0.

  3. anonymous
    • 5 years ago
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    How can I know the distance between Qa and Q0?

  4. JamesJ
    • 5 years ago
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    Pythagorus' Theorem. Call that distance r. Then \[ r^2 = (2a)^2 + (-2a)^2 = 8a^2 \] hence as r is positive, \[ r = \sqrt{8}a = 2\sqrt{2}a \]

  5. anonymous
    • 5 years ago
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    pythagorus theorem wont do, its not making a right angled triangle, use the point distance formula

  6. JamesJ
    • 5 years ago
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    It is making a right-angled triangle with respect to the coordinate directions. And that is exactly how we derive the formula for distance in Euclidean space.

  7. anonymous
    • 5 years ago
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    we can directly use the , point distance formula here http://upload.wikimedia.org/wikipedia/en/math/4/0/8/408e1a8e214282114e49fc9f2abee36d.png

  8. JamesJ
    • 5 years ago
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    Yes, it's the same thing.

  9. anonymous
    • 5 years ago
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    Thanks for your replies, but I dont have a value for a

  10. anonymous
    • 5 years ago
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    you have to get the ans in terms of a in this

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