A parallel-plate capacitor of capacitance is charged to and then disconnected from…
PHYSICS · Multi-part · A Level · Physics · Fields and their consequences · Fields and their consequences
Problem
A parallel-plate capacitor of capacitance 20pF is charged to 300V and then disconnected from the battery. A dielectric slab of constant 4 is inserted completely between the plates.
(a) (i) New potential after insertion (battery removed)
(b) (ii-a) Energy before insertion (battery connected)
(c) (ii-b) Energy after insertion (battery connected)
(d) (ii-c) Factor change in energy