PracticeTest2bsolutions

# PracticeTest2bsolutions - x axis has a length of 0.500 m...

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7. (10 points) Consider the circuit shown in the accompanying figure. What is the power dissipated (in watts) in the 5 Ω resistor? A) 8. 10 points) In the figure below, each capacitor has a capacitance of 4 μ F and V ab = +56.0 volts. Calculate the potential difference across C 4 Solution:

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7. (10 points) The batteries shown in the circuit in the figure have negligibly small internal resistances. Find the current through the a) 30 ohm resistor b) 20 ohm resistor and c) the 10 V battery 56 134.4 μ C So Q 4 = 134.4 μ C 134 μ C = 33.35 V
8. 10 points) In the figure below, each capacitor has a capacitance of 4 μ F and V ab = +56.0 volts. Calculate the potential difference across C 4 Solution: 7. For the circuit shown in the figure ( = 8.00 V, R = 6.00 ), calculate the following quantities. 56 134.4 μ C So Q 4 = 134.4 μ C 134 μ C = 33.35 V

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(a) (6 points) Calculate the current in the 2.00 resistor. (b) (4 points) Calculate the potential difference between points a and b . 8. A straight cylindrical wire lying along the
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Unformatted text preview: x axis has a length of 0.500 m and a diameter of 0.200 mm. It is made of a material that obeys Ohm's law with a resistivity of = 4.00 × 10-8 m. Assume that a potential of 4.00 V is maintained at x = 0 and that V = 0 at x = 0.500 m. (a) (2 points) What is the resistance ( R ) of the wire? (b) (2 points)What is the electric current in the wire? (c) (2points) What is the current density in the wire? Express vectors in vector notation. a) b) c) ( ) ( ) ( ) 8 2 4 4.00 10 m 0.500 m 0.637 1.00 10 m R A ρ π--× Ω⋅ = = = Ω × l 4.00 V 6.28 A 0.637 V I R Δ = = = Ω ( ) 8 2 2 2 4 6.28 A ˆ ˆ ˆ 2.00 10 A m 200 MA m 1.00 10 m I A-= = = × = × J i i i . Consider the system of capacitors shown in the figure ( C 1 = 3.00 µF, C 2 = 4.00 µF). (a) (2 points)Find the equivalent capacitance of the system. (b) Find the potential across each capacitor. (c) Find the charge on each capacitor. (d) Find the total energy stored by the group....
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## This note was uploaded on 11/01/2009 for the course PHY phy2049 taught by Professor Wilfredngwa during the Fall '09 term at University of Central Florida.

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PracticeTest2bsolutions - x axis has a length of 0.500 m...

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