MHT CET202124 Sep 2021Morning ShiftPhysicsElectrostaticsActual
Two, point charges +3 C and +8 C repel each other with a force of 40 ~N . If a charge of -5 C is added to each of them, then force between them will become
Options
- A-10 ~N
- B10 ~N
- C20 ~N
- D-20 ~N
Correct answer
A. -10 ~N
Step-by-step solution
q ₁=3 C and q ₂=8 C When third charge q₃=-5 C is added to each, then new charges on q ₁ and q ₂ will be q ₁=3-5=-2 C and q ₂=8-5=3 C Now, Case I: 40= 1 4 ₀ 3 8 r^2 Case II: F= 1 4 ₀ (-2 3) r^2 aligned & F 40 = -2 3 3 8 & F=-10 ~N aligned