Question

Three point charges of magnitude 5µC, 0.16µC and 0.3µC are located at the vertices A, B, C of a right angled triangle whose sides are AB = 3cm, BC 3√2  cm and CA = 3 cm and point A is the right angle corner. Charge at point A experiences _______ N of electrostatic force due to the other two charges.

Answer 1

Correct answer is : 17

\(F_{A C}=\frac{k(5 \times 0.3) \times 10^{-12}}{9 \times 10^{-4}} \)

\(F_{A B}=\frac{k(5 \times 0.16) \times 10^{-12}}{9 \times 10^{-4}} \)

\(F_{n e t}=\frac{k \times 10^{-12}}{9 \times 10^{-4}} \sqrt{1.5^2+(0.8)^2}\)

\(=\frac{10^9 \times 10^{-12}}{10^{-4}} \times 1.7=17\)