# Two small identical metal spheres, A and B, on insulated stands, are each given a charge of +2.4 10-6 coulomb. The distance between the spheres is 7 10-1 meter. Calculate the magnitude of the electrostatic force that the charge on sphere A exerts on the charge on sphere B.

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1. k = 9*10^9 approx as I remember

F = k Q1 Q2 / d^2
= 9*10^9 * 2.4*10^-6 * 2.4*10^-6 / 7*10^-1
= [9 * 2.4^2 / 7 ] * 10 ^-2

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Damon
2. What is the final answer?

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3. You do it, I check :)

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Damon
4. I got 0.07405 N

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5. So did I.

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Damon
6. The choices are
Fe= 9.0*10^-2N
Fe= 9.0*10^-1N
Fe= 6.0*10^-1N
Fe= 19.0*10^-1N

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7. I’m not sure any of these are close enough

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8. forgot to square distance

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Damon
9. Oh that’s probably it👍🏻I’ll try that

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10. Do u know how to do this question
Two small identical metal spheres,A and B, on insulated stands, are each given a charge of +2.0*10^-6 Coulomb. The distance between the spheres is 2.0*10^-1 meter. Calculate the magnitude of the electrostatic force that the charge on sphere A exerts on the charge on sphere B.

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11. 0.07405 N / 7*10^-1 = 0.1057 = 1.05*10^-1 N
still do not agree.

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Damon
12. I think I figured the first one out. I feel but I send u the wrong set of answer choices sorry u were right

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13. That is really the same question with different numbers
k Q1 Q2 / d^2
k = 9*10^9
Q1 = Q2 = 2*10^-6 Coulomb
d = 0.2 meter
F = 9*10^9 * 4*10^-12 / 0.04
= 900 *10^-3 = 0.900 N

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Damon
14. I figured then both out now thank you!

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15. Whew :)

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Damon
16. You are welcome.

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Damon