A Capacitor Is Attached Across a Battery and Charged

question 32

Multiple Choice

A capacitor is attached across a battery and charged.Then the battery is removed leaving the capacitor charged.The positive lead of the capacitor is then connected to one lead of a previously uncharged identical capacitor,and then the other lead of the charged capacitor is connected to the other lead of the second capacitor.How does the energy E_o stored in the originally charged capacitor compare to the energy E_f stored in the connected capacitors?

• A)E_o < E_f
• B)E_o = E_f
• C)E_o = 2E_f
• D)E_o = 4E_f

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Definitions:

Valence Electrons

The electrons in the outermost shell of an atom, which determine the atom's chemical properties and its ability to form bonds.

Hydrogen Bonds

Weak bonds between a hydrogen atom in one molecule and an electronegative atom (often oxygen or nitrogen) in another, important in the structure of water and DNA.

Carbon Atom

The fundamental chemical element with symbol C, essential to all known life forms and the basis of organic chemistry.

Carboxyl Group

A weakly acidic functional group; abbreviated —COOH.