A parallel plate air-core capacitor is connected across a source of constant potential difference. When a dielectric plate is introduced between the two plates then :
some charge from the capacitor will flow back into the source.
some extra charge from the source will flow back into the capacitor.
the electric field intensity between the two plate does not change.
the electric field intensity between the two plates will decrease.
Solution:
When a capacitor is connected to a source of constant potential difference (V), the voltage across its plates remains constant. The electric field intensity between the plates is given by (E = V/d), where (d) is the separation between the plates. Since both (V) and (d) are constant, the electric field intensity (E) will not change.
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