College Physics
11th Edition
ISBN: 9781305952300
Author: Raymond A. Serway, Chris Vuille
Publisher: Cengage Learning
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- A defibrillator is designed to pass a large current through a patient’s torso in order to stop dangerous heart rhythms. Its key part is a capacitor that is charged to a high voltage. The patient’s torso plays the role of a resistor in an RC circuit. When a switch is closed, the capacitor discharges through the patient’s torso. A jolt from a defibrillator is intended to be intense and rapid; the maximum current is very large, so the capacitor discharges quickly. This rapid pulse depolarizes the heart, stopping all electrical activity. This allows the heart’s internal nerve circuitry to reestablish a healthy rhythm.A typical defibrillator has a 32 μF capacitor charged to 5000 V. The electrodes connected to the patient are coated with a conducting gel that reduces the resistance of the skin to where the effective resistance of the patient’s torso is 100 Ω. If a patient receives a series of jolts, the resistance of the torso may increase. How does such a change affect the initial current…arrow_forwardA capacitor with a capacitance of 3.5 μF is initially uncharged. It is connected in series with a switch of negligible resistance, a resistor with a resistance of 19 kΩ, and a battery that has a potential difference of 170 V. What is the charge Q, in microcoulombs, on the capacitor when the current in the resistor equals one half its maximum value.arrow_forwardE2 R1 R2 2. Find the charge on the capacitor after the switch has been left open for some time, then closed for some period of time. We can assume that C = 2 µF, with batteries of values E1 R2 = 0.25 N. 2V and E2 =1V, and resistor values R1 = 0.5 N and Sarrow_forward
- In a heart pacemaker, a pulse is delivered to the heart 84 times per minute. The capacitor that controls this pulsing rate discharges through a resistance of 3.9 ✕ 106 Ω. One pulse is delivered every time the fully charged capacitor loses 63.2% of its original charge. What is the capacitance of the capacitor? Farrow_forwardAt t = 0 the switch S is closed with the capacitor uncharged. If C = 30 mF, ɛ = 30 V, and R = 7.7 kN, what is the potential difference across the capacitor when / = 2.0 mA? R O a. 22.30 V O b. 6.90 V O c. 18.45 V O d. 10.75 V O e. 14.60 Varrow_forwardA heart pacemaker fires 67 times a minute. Each time it fires, a 35.0 nF capacitor is charged by a battery in series with a resistor to 0.682 of its full voltage. What is the resistance?arrow_forward
- The capacitor with capacitance C₁ initially carries a charge Q (see figure below). While, the capacitor with capacitance C₂ is initially uncharged. The switch S is closed at time t = 0, and the charges begin to flow in the circuit. Find the charge flown through the wires as a function of time, q(t). QC₁ A) (0) (1 - e-(C₁+C₂)t/RC₁C₂) C₁+C₂ B) (02₂) (1 - e-(C₁+C₂)t/RC₁C₂) C₁+C₂ QC₁ C₂ C) (043) (1 — e¯(C₁+C₂)t/RC₂C₂) D) Q(1 + e-(₁+₂)t/RC1C₂) E) None of the above. +Q C₁ R C₂arrow_forwardA 11.8 µF capacitor is charged by a 30.5 V battery through a resistance R. The capacitor reaches a potential difference of 4.00 V a time 3.00 s after charging begins. Find R. Need Help? Read Itarrow_forwardThe figure shows a capacitor with a capacitance C=7.97uF & a resistor with resistance R= 8.23Mohms, connected to a battery, with E=25V. The circuit has a switch which is initially open. What is the time constant? (In seconds) -205.8 -65600000 -65.6 -.0000656 What is the max charge(in uC) on the capacitor after the switch is closed? -65.59 -199.25 -.00019925 -205.75 What is the current (in uA) through the resistor immediately after switch is closed? -3.04 -205.75 -.33 -effectively 0uA What is the current in the circuit 100 T after the switch is closed? -205.75uA -effectively 0uA -.33uA -3.04uAarrow_forward
- What is the time constant for charging this capacitor? Incorrect 4Sarrow_forwardSN 10. A 11.0 μF capacitor is connected in series to a 50.0-V battery, a is flowing through the resistor, 5.00 ms after closing the switch? Amp resistor, and a switch. What is the current that 550-52 resis 0 ssf60 ssf60 ss. 50 ssf60arrow_forwardIn the circuit shown in the figure the switch has been closed for a long time so that the capacitor is fully charged. At t=0 the switch is opened. Write an expression for the charge on the capacitor as a function of time. 12.0 kN 10.0 µF 9.00 V Ro = 15.0 kN 3.00 kN Select one: а. Q%3D 101С(1 — е 4/0.03) O b. Q = 50µCe-t/0.18 O c. 12μC(1-ε 4015) Q = 90µC(1 – e t/0.15) Q = 90µCe t/0.15 Q = 15µC(1 – e t/0.18) Q = 10µCe t/0.15 O h. Q = 90µCe t/0.03arrow_forward
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