$A$ capacitor is charged and then the battery is disconnected. If a dielectric slab is inserted between the plates,choose the correct statement.
- ACharge increases,voltage decreases,and electrostatic potential energy increases.
- BCharge remains constant,voltage increases,and electrostatic potential energy decreases.
- CCharge remains constant,and both voltage and electrostatic potential energy decrease.
- DNone of the above.
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