AP EAMCET202123 Aug 2021Morning ShiftPhysicsElectrostaticsActual
The minimum work needed to be done to bring a charge q=6 C from to a point 0.75 ~m from a charge Q=30 C is
Options
- A4.16 ~J
- B5.16 ~J
- C2.16 ~J
- D1.16 ~J
Correct answer
C. 2.16 ~J
Step-by-step solution
Given, first charge, q=6 C =6 10⁻⁶ C Charge, Q=30 C =30 10⁻⁶ C Final distance, r_f=0.75 ~m Initial distance, r_i= Since, work (W)=k Q q [ 1 r_f - 1 r_i ] where, k is Coulomb's constant =9 10^9 C ^2 ~kg ⁻² ~N ⁻¹ aligned W & =9 10^9 6 10⁻⁶ 30 10⁻⁶ ( 100 75 -0 ) & =2.16 ~J aligned