Most Important Selected Qs for JEE AdvancedPhysicsCapacitance
Following operation can be performed on a capacitor : X - connect the capacitor to a battery of emf E. Y - disconnect the battery. Z - reconnect the battery with polarity reversed. W - insert a dielectric slab in the capacitor.
Options
- AIn XYZ (perform X , then Y , then Z ) the stored electric energy remains unchanged and no thermal energy is de
- BThe charge appearing on the capacitor is greater after the action XWY than after the action XYW.
- CThe electric energy stored in the capacitor is greater after the action WXY than after the action XYW.
- DThe electric field in the capacitor after the action XW is the same as that after WX.
Correct answer
D. The electric field in the capacitor after the action XW is the same as that after WX.
Step-by-step solution
(B) First C increases (C) 1 2 CV ^2 & 1 2 Q ^2 KC (D) E = V d in both case potential difference across plate is same.