Acapacitor consists of two closely spaced metal conductors of large area, separated by a thin insulating foil. it has an electrical capacity of 3000.0 μf and is charged to a potential difference of 87.0 v. calculate the amount of energy stored in the capacitor.

The energy stored in a capacitor is given by:

where C is the capacitance and V is the potential difference applied across the capacitor.

In this problem, we have:

Substituting the numbers into the equation, we find the energy stored:

when insulating materials rub against each other, they may become electrically charged . electrons , which are negatively charged, may be 'rubbed off' one material and on to the other. the material that gains electrons becomes negatively charged. the material that loses electrons is left with a positive charge.

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