KCET2007PhysicsElectrostatics
Two identical charges repel each other with a force equal to 10 mg wt when they are 0.6 ~m a part in air (g=10 ~ms ⁻² ) . The value of each charge is
Options
- A2 mC
- B2 10⁻⁷ C
- C2 nC
- D2 C
Correct answer
D. 2 C
Step-by-step solution
Coulomb force is given by aligned F &= 1 4 ₀ q₁ q₂ r² (10 10⁻³ ) 10 &= (9 10⁹ ) q² (0.6)² or q² &= 10⁻¹ 0.36 9 10⁹ [ q₁=q₂=q ] &=4 10⁻¹² q &=2 10⁻⁶ C =2 C aligned