(a) What is the unknown emfx in a potentiometer that balances when Rx is 10.0 Ω , and balances when Rs is 15.0 Ω for a standard 3.000-V emf? (b) The same emfx is placed in the same potentiometer, which now balances when Rs is 15.0 Ω for a standard emf of 3.100 V. At what resistance Rx will the potentiometer balance?

(a) What is the unknown emfx in a potentiometer that balances when Rx is 10.0 Ω , and balances when Rs is 15.0 Ω for a standard 3.000-V emf? (b) The same emfx is placed in the same potentiometer, which now balances when Rs is 15.0 Ω for a standard emf of 3.100 V. At what resistance Rx will the potentiometer balance?

Physics for Scientists and Engineers: Foundations and Connections

1st Edition

ISBN:9781133939146

Author:Katz, Debora M.

Publisher:Katz, Debora M.

Chapter29: Direct Current (dc) Circuits

Section: Chapter Questions

Problem 19PQ

See similar textbooks

Similar questions

An ideal battery has an emf of 150V on the left side and a second emf on the right side of 50V. If R1 is 3Ω and R2 is 2Ω what is the current in the circuit and which direction does it go?
A potentiometer consisting of a wire of length = 10 cm has a source of emf, ɛ = 15V connected across it. When a standard cell with emf V = 6V, in series with a voltmeter, is connected at one end of the wire and at a distance L along the wire the voltmeter circuit is in balance and the voltmeter reads zero. What is the value of the balance length L? Select one: a. 2.0 cm b. 4.0 cm c. 1.5 cm d. 6.0 cm
The circuit contains three resistors, A, B, and C, which have equal resistances. epsilon = 110V. Which resistor generates the most thermal energy after the switch is closed? a.B b.A c.All three generate the same amount of thermal energy. d.C e.A and B
In a potentiometer arrangement, a cell of emf 1.25 V gives a balance point at 35.0 cm length of the wire. If the cell is replaced by another cell and the balance point shifts to 63.0 cm, what is the emf of the second cell?
A loop circuit has a resistance of R1 and a current of 1.9 A. The current is reduced to1.6 A when an additional 4.8 Ω resistor isadded in series with R1.What is the value of R1? Assume the internal resistance of the source of emf is zero.Answer in units of Ω.
In a series RC circuit shown, the switch is closed and after a short time, the charge q on the capacitor is 5.2 x 10-5 C. What is the current in the resistor at this time?
A 1.5-V emf source has an internal resistance of 0.50 Ω. After it has been connected to a load with a resistance R, the terminal voltage dropped to 1.45 V.How much current is passing through the circuit
When the switch S is toggled to the left, the capacitor C charges through the resistor R. When the switch is toggled to the right, the capacitor discharges current through the patient's torso, modeled as the resistor Rtorso, allowing the heart's normal rhythm to be reestablished. (a) If the capacitor is initially uncharged with C = 7.00 µF and = 1270 V, find the value of R (in ohms) required to charge the capacitor to a voltage of 795 V in 1.70 s. Ω (b) If the capacitor is then discharged across the patient's torso with Rtorso = 1270 Ω, calculate the voltage (in V) across the capacitor after 4.50 ms.
When the switch S is toggled to the left, the capacitor C charges through the resistor R. When the switch is toggled to the right, the capacitor discharges current through the patient's torso, modeled as the resistor Rtorso, allowing the heart's normal rhythm to be reestablished. (a)If the capacitor is initially uncharged with C = 8.25 µF and = 1270 V, find the value of R (in ohms) required to charge the capacitor to a voltage of 755 V in 1.70 s. answer in Ω b) If the capacitor is then discharged across the patient's torso with Rtorso = 1260 Ω, calculate the voltage (in V) across the capacitor after 4.50 ms. answer in V
In the circuit shown, the battery has EMF of c=32 V. At what rate is thermal energy being generated in the 60 resistor? (Ignore the internal resistance of the battery)
Calculate the emfx of a dry cell for which a potentiometer is balanced when Rx = 1.200 Ω , while an alkaline standard cell with an emf of 1.600 V requires Rs = 1.247 Ω to balance the potentiometer.
Consider a series RC circuit for which R = 1.00 MΩ, C = 5.00 μF, and ε = 30.0 V. Find (a) the time constant of the circuit and (b) the maximum charge on the capacitor after the switch is closed. (c) Find the current in the resistor 10.0 s after the switch is closed.