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toni_2374
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Homework Statement
1. Given a coloidal polystyrene particle with a diameter of 350 nm and a surface charge of 7.73. µC cm-2 evaluate: a) the electrostatic energy under and applied voltage of 100 mV
Homework Equations
particle charge density:
ρ = (3Q)/(4πR^3)
U0 =∫V (r)dq
The Attempt at a Solution
V(r)=q(r)/4πε0r
U0 =∫V (r)dq=(4π(ρ^2)R^5)/15ε0
BUT I DO NOT UNDERSTAND APPLIED VOLTAGE WHAT IT MEANS?