Question

When introducing a dielectric slab in between the capacitor, what are the variations on V,C,Q,U and E when battery is connected and disconnected

Answer 1

If you put a dielectric between a capacitor's plates you increase the capacitance. However, you need a voltage source to move charge into the plates. Remember the relationship Q/V=C.

Answer 2

and E= dV/dx where V is potential and x is distance....so increase or decrease in V is directly proportional to E

Answer 3

http://ocw.mit.edu/courses/physics/8-02-electricity-and-magnetism-spring-2002/video-lectures/lecture-12-review-exam-1-secret-top/ just watch it from abt 13 min

Answer 4

when battery is disconnected then q is constant
so on introducing dielectric field lines get affected so E will change so V and U will change
also c will change
when dielectric is disconnected so q is not constant it can flow but V is constant so E is also constant also c will change U will also change