Why does the electric field inside a dielectric decrease, Physics

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a) Why does the electric field inside a dielectric decrease when it is placed in an external electric field?

b) A parallel plate capacitor with air among the plates has a capacitance of 8 pF. What will be the capacitance if the distance among the plates he reduced by half and the space among them is filled with a substance of dielectric constant K=6?

 


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