# A 2.55 x 10^-4 C charge has an electric potential energy. Of 35.7?

A 2.55 x 10^-4 C charge has an electric

potential energy of 35.7 J when it is

placed 0.437 m from a second

charge. What is the value of the

second charge?

### 1 Answer

Relevance

- billrussell42Lv 72 months agoBest Answer
35.7 = (9e9)(2.55e-4)Q / 0.437

Q = (35.7)(0.437) / (9e9)(2.55e-4) = 6.80e-6 or 6.8 µC

Potential energy between two charges, in Joules

U = kQ₁Q₂/r

Q₁ and Q₂ are the charges in coulombs

r is separation in meters

k = 8.99e9 Nm²/C²

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