Tutorials in Introductory Physics
1st Edition
ISBN: 9780130970695
Author: Peter S. Shaffer, Lillian C. McDermott
Publisher: Addison Wesley
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Textbook Question
Chapter 6.1, Problem 4bT
Show that a simple application of the model for current that we have developed thus far is inadequate for determining how the brightness of bulb B changes when the switch is opened.
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The figure below shows a simplified model of a cardiac defibrillator, a device used to resuscitate
patients in ventricular fibrillation.
S
R
Rorso
+
The capacitor C charge through the resistor R (when the switch S is toggled to left) and discharge
current through the patient's torso which is of resistance (when the switch S is toggled to right). This
phenomenon allows the heart's normal rhythm to be reestablished.
(a) If the capacitor is initially uncharged with C = 7.0 µF; ɛ = 1240 V, find the value of R (in ohms)
required to charge the capacitor to a voltage of 800 V in 2.1 s.
(b) If the capacitor is then discharged across the patient's torso with Rtorso = 1200 Q, calculate the
voltage (in V) across the capacitor after 4.0 ms.
When a steady current, I, is flowing through a conductor (e.g. the carbon paper here) with a non-negligible resistance, R, it will be possible to maintain a potential difference, ∆V = IR, between parts of the conductor along the direction of the current. Explain why in this situation there should be an electric field in the direction of the current but not in the direction perpendicular to the current.
Apply the loop rule to loop 2 (the smaller loop on the right). Sum the voltage changes across each circuit element around this loop going in the direction of the arrow. Remember that the current meter is ideal.
Express the voltage drops in terms of VbVbV_b, I2I2I_2, I3I3I_3, the given resistances, and any other given quantities.
Chapter 6 Solutions
Tutorials in Introductory Physics
Ch. 6.1 - Obtain a battery, a light bulb, and a single piece...Ch. 6.1 - A student has briefly connected a wire across the...Ch. 6.1 - Light a bulb using a battery and a single wire....Ch. 6.1 - Carefully examine a bulb. Two wires extend from...Ch. 6.1 - Compare the brightness of the two bulb with each...Ch. 6.1 - Compare the brightness of each of the bulbs in the...Ch. 6.1 - We may think of a bulb as percentage an obstacle,...Ch. 6.1 - Compare the brightness of the bulbs in this...Ch. 6.1 - Is the brightness of each bulb in the two-bulb...Ch. 6.1 - Formulate a rule for predicting how the current...
Ch. 6.1 - Does the amount of current through a battery seem...Ch. 6.1 - Unscrew one of the bulbs in the two-bulb parallel...Ch. 6.1 - The circuit at tight contains three identical...Ch. 6.1 - Show that a simple application of the model for...Ch. 6.2 - The circuits at right contain identical batteries,...Ch. 6.2 - The circuits at right contain identical batteries...Ch. 6.2 - Predict the relative brightness of bulbs...Ch. 6.2 - Set up the circuit with a single bulb and the...Ch. 6.2 - Set up the circuit containing two bulbs in series...Ch. 6.2 - Predict what the voltmeter would read if it were...Ch. 6.2 - Set up the circuit with two bulbs in parallel as...Ch. 6.2 - Answer the following questions based on the...Ch. 6.2 - Set up the circuit with three bulbs as shown and...Ch. 6.2 - Before setting up the circuit shown at right:...Ch. 6.2 - Both circuits al right have more than one path for...Ch. 6.3 - A capacitor is connected to a battery, bulb, and...Ch. 6.3 - Remove the capacitor and the bulb from the...Ch. 6.3 - Suppose an uncharged capacitor is connected in...Ch. 6.3 - Suppose that instead of connecting the uncharged...Ch. 6.3 - Suppose that the bulbs were connected in parallel...Ch. 6.3 - After completing the experiments above, two...Ch. 6.3 - Suppose that a different capacitor of smaller...Ch. 6.3 - Before connecting the circuit a student makes the...Ch. 6.3 - Make the following prediction on the basis of your...
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