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1. An electron starts from rest 15.0 cm from the center of a uniformly charged insulating sphere of radius 10.0 cm and total negative charge -3.00 μC.What is the maximum speed (in m/s) the electron can reach after releasing it? (Note: Assume a reference level of the potential V = 0 at r = ∞)

2. Relevant equations

k_{e}= 8.99e9 Nm^2/C^2

k = 1/2 mv^2

E = k*Q/r^2

e = - 1.6e-19 C

m_{e}= 9.11e-31 kg

3. The attempt at a solution

I can't figure out what my Q will be in this problem, because I believe Q refers to the total charge of the sphere, not total negative charge of the sphere.

Please help, thank you!

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# Homework Help: Max speed -> electron

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