Question
How does the potential difference change with the effect of the dielectric when the battery remains connected across the capacitor?
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Answer
Remains constant
As the battery remains connected across the capacitor, so the potential difference remains constant at $V_0$ even after the introduction of the dielectric slab.
In this way, dielectric has an effect on potential difference.
As the battery remains connected across the capacitor, so the potential difference remains constant at $V_0$ even after the introduction of the dielectric slab.
In this way, dielectric has an effect on potential difference.
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