Questions from Modern Physics

Q: Unlike the idealized ammeter described in Section 25.4, any

Unlike the idealized ammeter described in Section 25.4, any real ammeter has a nonzero resistance. (a). An ammeter with resistance RA is connected in series with a resistor R and a battery of emf

Q: A cylindrical copper cable 1.50 km long is connected across

A cylindrical copper cable 1.50 km long is connected across a 220.0-V potential difference. (a). What should be its diameter so that it produces heat at a rate of 90.0 W? (b). What is the electric fi...

Q: A 1.50-m cylinder of radius 1.10

A 1.50-m cylinder of radius 1.10 cm is made of a complicated mixture of materials. Its resistivity depends on the distance x from the left end and obeys the formula

Q: Compact fluorescent bulbs are much more efficient at producing light than are

Compact fluorescent bulbs are much more efficient at producing light than are ordinary incandescent bulbs. They initially cost much more, but they last far longer and use much less electricity. Accord...

Q: A lightning bolt strikes one end of a steel lightning rod,

A lightning bolt strikes one end of a steel lightning rod, producing a 15,000-A current burst that lasts for 65 µs. The rod is 2.0 m long and 1.8 cm in diameter, and its other end is connected to the...

Q: Why should the permeability of a paramagnetic material be expected to decrease

Why should the permeability of a paramagnetic material be expected to decrease with increasing temperature?

Q: Consider the circuit shown in Fig. P25.72. The

Consider the circuit shown in Fig. P25.72. The battery has emf 72.0 V and negligible internal resistance. R2 = 2.00 Ω, C1 = 3.00 µF, and C2 = 6.00 mF. After the capacitors hav...

Q: A circular coil with area A and N turns is free to

A circular coil with area A and N turns is free to rotate about a diameter that coincides with the x-axis. Current I is circulating in the coil. There is a uniform magnetic field

Q: Consider the circuit shown in Fig. P25.73. The

Consider the circuit shown in Fig. P25.73. The emf source has negligible internal resistance. The resistors have resistances R1 = 6.00 Ω and R2 = 4.00 Ω. The capacitor has capacitance C = 9.00 µF. Whe...

Q: An external resistor R is connected between the terminals of a battery

An external resistor R is connected between the terminals of a battery. The value of R varies. For each R value, the current I in the circuit and the terminal voltage Vab of the battery are measured....