Practicing Success
For the circuit shown, which of the following statements is true ? |
With S1 closed, V1 = 15 V, V2 = 20 V With S3 closed, V1 = V2 = 25 V With S1 and S2 closed, V1 = V2 = 0 With S1 and S3 closed, V1 = 30 V, V2 = 20 V |
With S1 and S3 closed, V1 = 30 V, V2 = 20 V |
When S3 is closed, due to attraction with opposite charge, no flow of charge takes place through S3. Therefore, potential difference across capacitor plates remains unchanged or V1 = 30 V and V2 = 20 V. Alternate Solution Charges on the capacitors are q1 = (30)(2) = 60 pC and q2 = (20)(3) = 60 pC or q1 = q2 = q (say) The situation is similar as the two capacitors in series are first charged with a battery of emf 50 V and then disconnected. ∴ When S3 is closed, V1 = 30 V and V2 = 20 V |