CAPACITOR

Electric fields and capacitance
Whenever an electric voltage exists between two separated conductors, an electric field is present within the space between those conductors. In basic electronics, we study the interactions of voltage, current, and resistance as they pertain to circuits, which are conductive paths through which electrons may travel. When we talk about fields, however, we're dealing with interactions that can be spread across empty space. Capacitors are components designed to take advantage of this phenomenon by placing two conductive plates (usually metal) in close proximity with each other. There are many different styles of capacitor construction, each one suited for particular ratings and purposes. For very small capacitors, two circular plates sandwiching an insulating material will suffice. For larger capacitor values, the "plates" may be strips of metal foil, sandwiched around a flexible insulating medium and rolled up for compactness. The highest capacitance values are obtained by using a microscopic-thickness layer of insulating oxide separating two conductive surfaces. In any case, though, the general idea is the same: two conductors, separated by an insulator.
The schematic symbol for a capacitor is quite simple, being little more than two short, parallel lines When a voltage is applied across the two plates of a capacitor, a concentrated field flux is created between them, allowing a significant difference of free electrons (a charge) to develop between the two plates:

ASSIGNMENT ----CAPACITOR

Q1) If the plates of a capacitor are suddenly connected to each other by a wire, what will happen?
Q) The distance between the plates of a capacitor is d. A metal plate of thickness d/2 is placed between the plates; what will be the effect on the capacitance?
Q) Is there any material which when inserted b/w the plates of a capacitor reduces its capacitance?

Q) The plates of a capacitor are connected by a voltmeter. If the plates are moved further apart what will be the effect on the reading of voltmeter?

Q) Sketch graph to show how the capacitance of a capacitor varies with charge given to it.

Q) A charged air capacitor has energy stored U. What will be the energy stored air is replaced by a dielectric of constant "K" ; CHARGE remaining same.

Q) Why does the polarization of dielectric reduce the electric field inside it?

Q) What happens to the energy stored in a capacitor when the plates of charged capacitor are moved farther after -------a) connecting , b) disconnecting the battery.

Q) Two capacitor C-1 and C-2 are connected in parallel. A charge 'q' is given to this combination.What will be the p.d. across each capacitor?

Q) Two spheres of Cu of same radii--- one hollow and other solid are charged to same potential. Which possesses more charge?