Concepts Of Physics MCQ Edition [Volume 2]PhysicsCapacitors
The capacitance between the adjacent plates depicted in the figure is 50 ext nF . A charge of 1.0 ext C is placed on the middle plate. Determine the charge on the outer surface of the upper plate.
Options
- A0.25 ext C
- B1.0 ext C
- C0.50 ext C
- D0 ext C
Correct answer
C. 0.50 ext C
Step-by-step solution
Let the three parallel plates be 1 (upper), 2 (middle), and 3 (lower). The charges given to the plates are: Q₁ = 0 Q₂ = 1.0 C Q₃ = 0 The total charge on the system of plates is: Q_ net = Q₁ + Q₂ + Q₃ = 0 + 1.0 C + 0 = 1.0 C For a system of parallel conducting plates, the electric field inside the bulk of any conducting plate must be zero. By applying Gauss's law or the principle of superposition of electric fields due to charged sheets, it can be shown that the charge appearing on the outermost surfaces of the syst