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  4. C, V, U and Q are capacitance, potential difference, energy stored and charge of a parallel plate capacitor respectively. The quantities that, increase when a dielectric slab is introduced between the plates without disconnecting the battery are

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Q. $C, V, U$ and $Q$ are capacitance, potential difference, energy stored and charge of a parallel plate capacitor respectively. The quantities that, increase when a dielectric slab is introduced between the plates without disconnecting the battery are

KEAMKEAM 2009

Solution:

When battery remains connected
$ C=KC $ $ Q=KQ $ $ V=V $ $ E=E $ $ U=KU $
Hence, Q and U increase.