R= 6.02 1.20 m,
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A conductive rod can slide on two conductive rails, as shown in the figure. What speed must the bar have for a current of 0.5A to flow through the resistor?
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- Consider the arrangement shown in the figure below where R = 9.00 0, { = 1.40 m, and B = 2.25 T. * x x x x x x x R. Fapp HINT (a) At what constant speed (in m/s) should the bar be moved to produce a current of 1.20 A in the resistor? m/s (b) What power (in W) is delivered to the resistor? W (c) What magnetic force (in N) is exerted on the moving bar? (Enter the magnitude.) (d) What instantaneous power (in W) is delivered by the force F app on the moving bar? WThe figure below shows a simplified model of a cardiac defibrillator, a device used to resuscitate patients in ventricular fibrillation. R HINT E S C 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. R torso V (a) If the capacitor is initially uncharged with C = 7.25 µF and E = 1220 V, find the value of R (in ohms) required to charge the capacitor to a voltage of 755 V in 1.60 s. Ω (b) If the capacitor is then discharged across the patient's torso with Rtorso = 1270 , calculate the voltage (in V) across the capacitor after 4.50 ms.Taking R = 1.50 kΩ and ε = 150 V in the figure shown below, determine the magnitude and direction of the current in the horizontal wire between a and e. 17.5 mA, from e to a19.9 mA, from a to e 18.0 mA, from e to a18.9 mA, from a to e18.0 mA, from a to e19.9 mA, from e to a
- In the figure R1 = 10.7 kΩ, R2 = 14.7 kΩ, C = 0.405 μF, and the ideal battery has emf ε = 25.0 V. First, the switch is closed a long time so that the steady state is reached. Then the switch is opened at time t = 0. What is the current in resistor 2 at t = 3.80 ms?A 60.5 m length of insulated copper wire is wound to form a solenoid of radius 2.2 cm. The copper wire has a radius of 0.51 mm. (Assume the resistivity of copper is p = 1.7 x 10-8. m.) (a) What is the resistance of the wire? Ω (b) Treating each turn of the solenoid as a circle, how many turns can be made with the wire? turns (c) How long is the resulting solenoid? m (d) What is the self-inductance of the solenoid? mH (e) If the solenoid is attached to a battery with an emf of 6.0 V and internal resistance of 350 m2, compute the time constant of the circuit. ms (f) What is the maximum current attained? A (g) How long would it take to reach 99.9% of its maximum current? ms (h) What maximum energy is stored in the inductor? mJWhen the switch is open, the potential difference across the terminals of a battery is 20 0.0V. When a current of 2.0A flows, the potential difference across the battery drop to 16V. If this battery consists of two identical cells in series, what is the electromotive force of each cell? 8.0V 10.0V 16.0V 20.0V
- A resistor composed of carbon =(p=3.5*10^5 Ω*m) having a radius of 1.2mm and a length of 3.1mm is connected to a 6V batter. How much energy is dissipated by the resistor in 5 minutes?In the accompanying figure, the rails, connecting end pieces, and rod all have a resistance per unit length of 40/cm. The rod moves to the left at v = 3 m/s. If B = 0.65 T everywhere in the region, what is the current in the circuit (a) when a = 8 cm? (b) when a = 4.5 cm? Description of Image B Hint a. When a = 8 cm, a counterclockwise mA flows in the circuit. b. When a = = 4.5 cm, 5.48 o current of 9.75 4.0 cm X = 5.48 mA flows in the circuit. X = 9.75In the circuit below, it is known that R1 = 10 kΩ, R2 = 15 kΩ, and C = 0.4 μF, and a battery with an Emf of 20 Volts. Initially, the connector (switch) is connected for a long time until it reaches a steady state. Then the switch is disconnected/opened at t = 0. What is the current flowing in resistor 2 at t = 4 ms?