In the figure below, R1 =10.0kΩ, R2 =15.0kΩ, C=0.40μF, and the ideal battery has an emf E=20.0V. First, the switch is closed until the system reaches steady state; then, the switch is opened at time t = 0 and the capacitor starts to discharge. What is the current in R2 at t = 3.00 ms?

In the circuit of the figure, 1 =1.5 kV, C = 6.0 F, R1 = R2 = R3 = 0.82 M. With C completely uncharged, switch S is suddenly closed (at t = 0). At t = 0, what are (a) current i1 in resistor 1, (b) current i2 in resistor 2, and (c) current i3 in resistor 3? At t =  (that is, after many time constants), what are (d) i1, (e) i2, and (f) i3? What is the potential difference V2 across resistor 2 at (g) t = 0 and (h) t = 

9. At its normal operating speed, an electric motor draws only 13.0% of the current it draws when it just begins to turn. The motor is plugged into a 115-V socket. What back emf does the motor generate at its normal operating speed? V

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)

In the circuit shown in Fig, switch S1 has been closed a long time while switch S2 has been left open. Then S2 is closed at the same instant when S1 is opened. Just after S2 is closed, the current through the resistor is 12.0 A and its rate of decrease is di/dt = -36.0 A/s. How long does it take the current to decrease to 6.00 A, one-half its initial value?

A 0.364 kg toy car is powered by four AA batteries (6.00 V total) connected directly to a small DC motor. The car has an effective energy conversion efficiency of 52.6%, meaning that 52.6% of the electric energy applied to the motor is converted into translational kinetic energy. After 4.96 s, the car, which is initially at rest, reaches a speed of 2.35 m/s. What is the average current supplied to the car's motor? average current: A

A light bulb is connected via 2 copper wires of length L = 10 m and diameter d = 0.7 mm with aDC voltage source and a switch. The resulting current is I = 1 A and the density of charge carriersis n=5 ⋅ 10^28 m−3. At time t = 0, the switch is flipped, closing the before open circuit. After whattime t1 does the lightbulb begin to shine?

In the circuit below, R1 = 105 Q, R2 = 0.02 Q, ɛ = 21, and L = 19 mH. Switch 1 has been closed for a while. Att 0, switch 2 is closed and then switch 1 is opened. What is the current through R2 at t = 0.2 seconds? R,

An electrical heating coil is immersed in 3.52kg of water at 22C. The coil, which has a resistance of 230 ohms warms the water to 32C in 3.5 min.At what potential difference does the coil operate?

In the figure, & = 111 V. R₁ = 9.83 0, R₂ = 27.80, R3 = 28.80, and L = 2.92 H. Immediately after switch 5 is closed, what are (a)i₁ and (b) i₂? (Let currents in the indicated directions have positive values and currents in the opposite directions have negative values.) A long time later, what are (c) i₁ and (d) i₂? The switch is then reopened. Just then, what are (e) i₁ and (f) i₂? A long time later, what are (g) 1₁ and (h) i₂? (a) Number i (b) Number i (c) Number (d) Number (e) Number i (f) Number i (g) Number i (h) Number i Units Units Units Units Units Units Units Units 8 ww www R₂ ele L