A Tiny 00250-µG Oil Drop Containing 15 Excess Electrons Is Suspended Between

question 7

Short Answer

A tiny 0.0250-µg oil drop containing 15 excess electrons is suspended between two horizontally closely-spaced metal plates that carry equal but opposite charges on their facing surfaces. The plates are both circular with a radius of 6.50 cm. (k = 1/4πε₀ = 9.0 × 10⁹ N ∙ m²/C², e = 1.6 × 10^-19
C)
(a) How much excess charge must be on each plate to hold the oil drop steady?
(b) Which plate must be positive, the upper one or the lower one?

Comprehend the concept of brain plasticity and how damage to specific brain areas affects function.

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