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Class 12 › Physics › Electric Potential & Capacitance
CBSE2022Class Class 12 · Physics1 Marks · Mcq✅ Verified
A parallel plate capacitor is first charged and then a dielectric slab is introduced between the plates (battery disconnected). The quantity that remains unchanged is
A. Charge
B. Energy
C. Potential
D. Capacitance
✅ Answer & Solution
✅ Correct Answer: A
✅ Correct Answer: (A) Charge
📌 Condition: Battery is <b>disconnected</b> before inserting dielectric.
Quantity | Before Dielectric | After Dielectric (K > 1)
─────────────────────────────────────────────────────────
Charge (Q) | Q | Q → <b>Unchanged</b> ✓
Capacitance (C) | C | KC → Increases
Potential (V) | V | V/K → Decreases
Energy (U) | U | U/K → Decreases
∴ <b>Charge remains unchanged</b> (no path for charge to flow).
