Please show all work and specify the correct answer at the bottom. Please do not

Question

Please show all work and specify the correct answer at the bottom. Please do not put down an answer that is not one of the choices, I will thumbs you down. Correct answer will get five stars and thumbs up.

An air-filled parallel-plate capacitor is connected to a battery and allowed to charge up. Now a slab of dielectric material is placed between the plates of the capacitor while the capacitor is still connected to the battery. After this is done, we find that

the charge on the capacitor had increased. the charge on the capacitor had not changed. the energy stored in the capacitor had decreased. the voltage across the capacitor had increased. None of these choices are true

Explanation / Answer

here,

as the battery is connected

the voltage remains the same

and

when the dielectric is added

the capacitance is increased ( C' = k * C)

as Q * C * V,

the charge on the capacitor is increased

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