Figure P30.37 000 Ammeter

Chapter 27, Problem 065 GO In the figure R₁ = 10.9 kN, R₂ = 15.0 kN, C = 0.430 µF, and the ideal battery has emf ε = 23.0 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 = 4.00 ms? R₁ HH C R₂

Lucía, a young woman from Veracruz, uses a hair straightener every morning to straighten it and leave it well combed. His father traveled to France and brought him a new iron. The appliance's label indicates that it has a power of 1670 W and requires a potential difference of 220 V to work properly. We know that in the Mexican Republic the nominal voltage is 129 V. What would be the intensity of electrical current in the hair straightener if it were connected in Europe? Select one:12.95A7.59A1.32A0.77A

A copper wire with a square cross-section (side length 5.00 µm) is next to an iron wire with a rightward current of 3.00 A. The two wires are parallel over a region of 20.0 cm, where they are 1.60 cm apart. The iron wire produces a magnetic field on the copper wire. The copper wire is connected to a 5.00 V power source, with current directed rightward. Data of copper: resistivity = 1.68 x 10-8 Ohm m; free electron number density = 8.50 x 1028/m3

The switch in the figure below has been in position A for a long time. Assuming the switch moves instantaneously from A to B at t=0. Find v for t=20 ms. v  =  (V)

Two very long, parallel wires are separated by d = 0.065 m. The first wire carries a current of I1 = 0.75 A. The second wire carries a current of I2 = 0.65 A. Express the minimal work per unit length needed to separate the two wires from d to 2d.

You have a faculty position at a community college and are teaching a class in automotive technology. You are deep in a discussion of using jumper cables to start a car with a dead battery from a car with a fresh battery. You have drawn the circuit diagram in Figure 2 to explain the process. The battery on the left is the live battery in the correctly functioning car, with emf ε and internal resistance RL, where the L subscript refers to “live.” Its terminals are connected directly across those of the dead battery, in the middle of the diagram, with emf ε and internal resistance RD, where the D subscript refers to “dead.” Then, the starter in the car with the dead battery is activated by closing the ignition switch, allowing the car to start. The resistance of the starter is RS. A student raises his hand and asks, “So is the dead battery being charged while the starter is operating?” How do you respond?

Q18

RAŽ ŽRB Rc RD ɛ = 12 V, RA = 5 Q, RB = 3 2, Rc = 1 Q, and Rp = 3 2. The switch is open. a) What is the battery current? (include units) b) What is the difference in electric potential between points a and b? (include units) c) The switch is closed. What is the battery current? (include units) d) The switch is closed. What is the difference in electric potential between points a and b? (include units)

For the circuit shown in the figure, C = 12 µF and R = 8.5 MΩ. Initially the switch S is open with the capacitor charged to a voltage of 80 V. The switch is then closed at time t = 0.00 s. What is the charge on the capacitor, when the current in the circuit is 3.3 µA?