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Question:

How many electrons have been removed from the sphere to raise it to this potential?

An isolated aluminum sphere of radius 2.5 cm is at a potential of 400 VHow many electrons have been removed from the sphere to raise it to this potential?

Answer:

Try Magic ErasersI've used them with success on my stove.
Charge q Vr/k, where k 8.99E9 Nm^2/C^2The number of electrons q6.2415E18.

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