Question

Two point charges q and 10q repel each other with a force of 3.6 ×10^-5 N when they are 0.02 metres apart. Find the charges.

Answer 1

Force between 2 point charges is given by

F = kq₁q₂/r²

3.6 × 10^-5 N = 9 × 10^9 Nm^2/C^2 × q × 10q / (0.02 m)^2

q = sqrt((3.6 × 10^-5 × (0.02)^2) / (9 × 10^9 × 10)) C = 4 × 10^-10 C

∴ Charges are
q = 4 × 10^-10 C
10q = 10 × 4 × 10^-10 C = 4 × 10^-9 C

Answer 2

Answer:

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