Acharged capacitor stores energy u. without connecting this capacitor to anything, dielectric having dielectric constant k is now inserted between the plates of the capacitor, completely filling the space between them. how much energy does the capacitor now store?

U / K

Explanation:

The energy stored in the capacitor is given by

where, q be the charge and C be the capacitance of the capacitor.

If a dielctric is inserted beteen the plates of capacitor having dielctric constant K, the new capacitance is C' = KC

The charge will remain same

The new energy stored is

U' = U / K

So, the energy reduces by the factor of K.

it breaks and dirupture other materials and other sencews from the bottom

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