If the potential difference between the plates of a charged and isolated parallel-plate condenser of capacitance 1 μF changes from 12 V to 4 V when a dielectric slab of dielectric constant K is introduced to fill the entire space between the plates, then

The change in the charge on the capacitor is 8 µC

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The change in the capacity is 3 µF

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The electric field in the capacitor increases by 100 %

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The value of K is 3

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Solution

The correct option is D
The value of K is 3

In isolated condenser the charge is conserved. Introducing the dielectric increases the capacity from C to KC, decreases the potential from V to V/K. The electric field decreases from E to E/K

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If the potential difference between the plates of a charged and isolated parallel-plate condenser of capacitance 1 μF changes from 12 V to 4 V when a dielectric slab of dielectric constant K is introduced to fill the entire space between the plates, then

The correct option is D The value of K is 3In isolated condenser the charge is conserved. Introducing the dielectric increases the capacity from C to KC, decreases the potential from V to V/K. The electric field decreases from E to E/K

The correct option is D
The value of K is 3

In isolated condenser the charge is conserved. Introducing the dielectric increases the capacity from C to KC, decreases the potential from V to V/K. The electric field decreases from E to E/K