Explanation
If a dielelectric slab is inserted in between the plates of charged capacitor the intensity of electric field, potential difference of the capacitor increases K times. But the charge on the capacitor remains unchanged.
Each plate is taking part in the formation of two capacitor except the capacitor at ends.These capacitors are in parallel and n plates from (n-1) capacitors.So equivalent capacitor = (n-1) C
Since the plates of the capacitor have equal and opposite charge. So net charge enclosed is zero. Hence the net flux will be zero.
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