Electrostatics Question 172
Question: Two charges each of $ 1\ coulomb $ are at a distance $ 1km $ apart, the force between them is [CPMT 1977; DPMT 1999]
Options:
A) $ 9\times 10^{3}\ Newton $
B) $ 9\times {{10}^{-3}}\ Newton $
C) $ 1.1\times {{10}^{-4}}\ Newton $
D) $ 10^{4}\ Newton $
Show Answer
Answer:
Correct Answer: A
Solution:
$ F=\frac{kQ^{2}}{r^{2}}=9\times 10^{9}\times 1^{2}\times \frac{1}{{{(1000)}^{2}}}=9\times 10^{3}N $
