A Parallel-Plate Capacitor of Capacitance C Is Connected to a Battery

question 6

Multiple Choice

A parallel-plate capacitor of capacitance C is connected to a battery of voltage V until it is fully charged. The energy density in the capacitor is then equal to u. If the same capacitor is then connected to a battery of voltage 2V its energy density becomes equal to

• A)u.
• B)u/4.
• C)u/2.
• D)2u.
• E)4u.

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