CAIE A-Level Physics A2 18.3.2 Coulombs Law F Q1q2 4 0 R 2 For the Force Between Two Point Charges

[Maximum number: 4]

(a)

State Coulomb's law.

[ 2 ]

(b)

Two identical oil droplets are in a vacuum. The centres of the droplets are a distance of $3.8 \times 10^{-6} \mathrm{~m}$ apart. The droplets have equal charge and exert an electric force on each other of magnitude $6.3 \times 10^{-17} \mathrm{~N}$ .

Determine the magnitude of the charge on each droplet.
charge = C

[ 2 ]

$F=Q^{2} / 4 \pi \varepsilon_{0} X^{2}$ $6.3 \times 10^{-17}=Q^{2} /\left[4 \pi \times 8.85 \times 10^{-12} \times\left(3.8 \times 10^{-6}\right)^{2}\right]$
charge $=3.2 \times 10^{-19} \mathrm{C}$

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CAIE A-Level Physics A2 18.3.2 Coulombs Law F Q1q2 4 0 R 2 For the Force Between Two Point Charges Topic Practice

Question 1

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Question (b)