Hwk6A - PHYS 153 Term 2 2008-09 Homework 6A Mar 2 6 Problem 1 How much current flows through the bottom wire in the figure below and in which

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Unformatted text preview: PHYS 153 Term 2, 2008-09 Homework 6A Mar. 2 - 6 Problem 1 How much current flows through the bottom wire in the figure below, and in which direction? 6Ω 10 Ω 9V 12 Ω 24 Ω + _ Problem 2 + _ + _ 15 V Bottom Wire Figure 1: fig. for Problem 1 The switch in the figure has been closed for a very long time. (a) What is the charge on the capacitor? (b) The switch is opened at t = 0 s. At what time has the charge on the capacitor decreased to 10% of its initial value? Opens at t = 0 s 60 Ω 10 Ω 100 V 40 Ω 2.0 µF Figure 2: fig. for Problem 2 Problem 3 The Wheatstone Bridge The circuit shown in the figure below, called a Wheatstone bridge, is used to determine the value of an unknown resistor X by comparison with three 1-1 resistors M , N , and P whose resistances can be varied. For each setting, the resistance of each resistor is precisely known. With switches K1 and K2 closed, these resistors are varied until the current in the galvanometer G is zero; the bridge is then said to be balanced. (a) Show that under this condition the unknown resistance is given by X = M P/N . (This method permits very high precision in comparing resistors.) (b) If the galvanometer G shows zero deflection when M = 850.0 Ω, N = 15.00 Ω, and P = 33.48 Ω, what is the unknown resistance X ? G + Figure 3: fig. for Problem 3 Problem 4 An electron in a cathode-ray tube is accelerated through a potential difference of 10 kV, then passes through the 2.0-cm-wide region of uniform magnetic field in the figure below. What field strength will deflect the electron by 10◦ ? Figure 4: fig. for Problem 4 Problem 5 A proton moving in a uniform magnetic field with v1 = 1.00 × 106ˆ m/s experiences force i ˆ ˆ F1 = 1.20 × 10−16 k N. A second proton with v2 = 2.00 × 106 ˆ m/s experiences F2 = j ˆ −4.16 × 10−16 k N in the same field. What is B ? Give your answer as a magnitude and an angle measured ccw from the +x-axis. 1-2 ...
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This note was uploaded on 02/03/2010 for the course PHYS PHYS 153 taught by Professor Billmcutcheon during the Spring '09 term at The University of British Columbia.

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Hwk6A - PHYS 153 Term 2 2008-09 Homework 6A Mar 2 6 Problem 1 How much current flows through the bottom wire in the figure below and in which

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