(adsbygoogle = window.adsbygoogle || []).push({}); 1. The problem statement, all variables and given/known data

A spherical drop of water carrying a charge of 24 pC has a potential of 490 V at its surface (with V = 0 at infinity).

(a) What is the radius of the drop?

(b) If two such drops of the same charge and radius combine to form a single spherical drop, what is the potential at the surface of the new drop?

2. Relevant equations

V=kQ/r

3. The attempt at a solution

If V=kQ/r then if the radius is doubled and the charge is doubled, why isn't the answer the same? V=2kQ/2r = kQ/r

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# Spherical droplet - potential

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