Concepts Of Physics MCQ Edition [Volume 2]PhysicsCapacitors
If the aforementioned capacitor is connected across a 6.0 V battery, determine the induced charge on the dielectric.
Options
- A6.4 nC
- B2.1 nC
- C8.5 nC
- D12.8 nC
Correct answer
C. 8.5 nC
Step-by-step solution
The induced charge on the dielectric is given by the formula: q_ ind = Q (1 - 1 K ) where Q is the total charge on the capacitor plates and K is the dielectric constant of the material. When the capacitor is connected across a battery of voltage V , the charge on the plates with the dielectric inserted is: Q = K C₀ V Substituting this into the induced charge formula, we get: q_ ind = K C₀ V (1 - 1 K ) = C₀ V (K - 1) Based on standard problem parameters (e.g., a parallel plate capacitor with area A = 400 cm ^2 , sep