BITSAT2023PhysicsElectrostaticsActual
The force between two small charged spheres having charges of 1 10⁻⁷ C and 2 10⁻⁷ C placed 20 ~cm apart in air is
Options
- A4.5 10⁻² ~N
- B5.4 10⁻² ~N
- C4.5 10⁻³ ~N
- D5.4 10⁻³ ~N
Correct answer
C. 4.5 10⁻³ ~N
Step-by-step solution
Here, q₁=1 10⁻⁷ C , q₂ and 2 10⁻⁷ C , r=20 ~cm =20 10⁻² ~m F= q₁ q₂ 4 ₀ r^2 = 9 10^9 1 10⁻⁷ 2 10⁻⁷ (20 10⁻² )^2 =4.5 10⁻³ N