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F95(1) - Physics 4B SECOND EXAM Chapters 26 28 Spring 1995...

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1 Physics 4B SECOND EXAM Chapters 26 - 28 Spring 1995 Name:_________________________________________ Solve the following problems in the space provided. Use the back of the page if needed. Each problem is worth 20 points. You must show your work in a logical fashion starting with the correctly applied physical principles which are on the last page. Your score will be maximized if your work is easy to follow because partial credit will be awarded. 1. The plates of a parallel plate capacitor are 4.00cm apart. The capacitor is charged when it is connected to a battery. The battery is disconnected then the separation between the plates is changed until the energy stored in the capacitor is doubled. Find the new separation between the plates. The energy of a capacitor is, U = 1 2 Q 2 C . Using the capacitance of parallel plates C = ε o A d , U = 1 2 Q 2 ε o A d = Q 2 d 2 ε o A . Since the battery is disconnected, the charge on the plates remains fixed. The new energy is, U = Q 2 d 2 ε o A .

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