Per10_exercise - source. If the final voltage on the...

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Solutions to Period 10 Exercises E.1 Suppose that the Styrofoam ring you levitated in class has a mass of 0.005 grams and floated 5 cm above the rod. How large was the electrical force that supported the ring? ( Hint: what forces act on the floating ring? How do the amounts of these forces compare?) a) 4.9 x 10 -2 newtons b) 5.0 x 10 -3 newtons c) 4.9 x 10 -5 newtons d) 2.5 x 10 -6 newtons e) 2.5 x 10 -7 newtons F electrical = F gravity = M g = 0.005 g x 1 kg x 9.8 m/s 2 = 0.000049 N 1000 g = 4.9 x 10 -5 N E.1 = c 10- Ex 1
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E.2 How much electrical potential energy is stored if 0.5 coul of charge is raised to a voltage of 10 volts? a) 5 joules b) 10 joules c) 20 joules d) 10 volts e) 25 volts E pot = Q V = 0.5 coul x 10 V = 5 J E.2 = a E.3 You wish to store 5 coulombs of charge on a capacitor, using a battery as the energy
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Unformatted text preview: source. If the final voltage on the capacitor is 6 volts, what is the total energy stored on the capacitor? a) 5 joules b) 6 joules c) 15 joules d) 30 joules e) 180 joules E cap = Q V final = (5 coul) x 6 volts = 15 J E.3 = c 10-Ex 2&3 E.4 A 1.0 farad capacitor stores 5 joules of electrical potential energy. How many such charged capacitors would it take to equal the 0.7 million joules of chemical energy stored in a bottle of gasoline the size of one of these capacitors? 1 capacitor x 700,000 J = 140,000 cap 5 J 1 bottle bottle 10-Ex 4 Solutions to Period 10 Exercises E.1 = c E.2 = a E.3 = c E.4 = 140,000 capacitors/bottle...
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This note was uploaded on 06/11/2011 for the course PHYSICS 103 taught by Professor Staff during the Spring '10 term at Ohio State.

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Per10_exercise - source. If the final voltage on the...

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