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Chapter 19: Q63PE (page 698)
(a) What is the energy stored in the capacitor of a heartdefibrillator charged to ? (b) Find the amount of storedcharge.
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Find the charge stored when \(5.50{\rm{ }}V\) is applied to an \(8.00{\rm{ }}\mu F\) capacitor.
Water has a large dielectric constant, but it is rarely used in capacitors. Explain why.
In one of the classic nuclear physics experiments at the beginning of the \(20{\rm{ }}th\) century, an alpha particle was accelerated toward a gold nucleus, and its path was substantially deflected by the Coulomb interaction. If the energy of the doubly charged alpha nucleus was \(5.00{\rm{ }}MeV\), how close to the gold nucleus (\(79\) protons) could it come before being deflected?
In open heart surgery, a much smaller amount of energy will defibrillate the heart.
(a) What voltage is applied to the \(8.00{\rm{ }}\mu F\)capacitor of a heart defibrillator that stores \(40.0{\rm{ }}J\) of energy?
(b) Find the amount of stored charge.
A nervous physicist worries that the two metal shelves of his wood frame bookcase might obtain a high voltage if charged by static electricity, perhaps produced by friction.
(a) What is the capacitance of the empty shelves if they have area \(1.00 \times {10^2}\;{m^2}\) and are \(0.200\;m\) apart?
(b) What is the voltage between them if opposite charges of magnitude \(2.00nc\) are placed on them?
(c) To show that this voltage poses a small hazard, calculate the energy stored.
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