Questions from College Physics

Q: A dead battery is charged by connecting it to the live battery

A dead battery is charged by connecting it to the live battery of another car with jumper cables (Fig. P18.28). Determine the current in (a) The starter and in (b) The dead battery. Figure P18.28:

Q: An emf of 10 V is connected to a series RC circuit

An emf of 10 V is connected to a series RC circuit consisting of a resistor of 2.0 x 106 Ω and an initially uncharged capacitor of 3.0 μF. Find the time required for the charge on the capacitor to rea...

Q: (a) Can the circuit shown in Figure P18.29

(a) Can the circuit shown in Figure P18.29 be reduced to a single resistor connected to the batteries? Explain. (b) Find the magnitude of the current and its direction in each resistor. Figure P18.29...

Q: For the circuit shown in Figure P18.30, use Kirchhoff’s

For the circuit shown in Figure P18.30, use Kirchhoff’s rules to obtain equations for (a) The upper loop, (b) The lower loop, and (c) The node on the left side. In each case suppress...

Q: Find the potential difference across each resistor in Figure P18.31

Find the potential difference across each resistor in Figure P18.31. Figure P18.31:

Q: Show that ( = RC has units of time.

Show that ( = RC has units of time.

Q: Consider the series RC circuit shown in Figure 18.17 for

Consider the series RC circuit shown in Figure 18.17 for which R = 75.0 kΩ, C = 25.0 μF, and ε = 12.0 V. Find (a) The time constant of the circuit and (b) The ch...

Q: An uncharged capacitor and a resistor are connected in series to a

An uncharged capacitor and a resistor are connected in series to a source of emf. If ε = 9.00 V, C = 20.0 μF, and R = 1.00 x 102 Ω, find (a) The time constant of the circuit, (b) The maximum charge on...

Q: Consider a series RC circuit as in Figure P18.35 for

Consider a series RC circuit as in Figure P18.35 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 maximu...

Q: The RC charging circuit in a camera flash unit has a voltage

The RC charging circuit in a camera flash unit has a voltage source of 275 V and a capacitance of 125 μF. (a) Find its resistance R if the capacitor charges to 90.0% of its final value in 15.0 s. (b)...