Questions from Modern Physics

Q: The battery for a certain cell phone is rated at 3.

The battery for a certain cell phone is rated at 3.70 V. According to the manufacturer it can produce 3.15 × 104 J of electrical energy, enough for 5.25 h of operation, before needing to be recharged....

Q: Pure silicon at room temperature contains approximately 1.0 × 1016

Pure silicon at room temperature contains approximately 1.0 × 1016 free electrons per cubic meter. (a). Referring to Table 25.1, calculate the mean free time t for silicon at room temper...

Q: (a). Calculate the potential energy of a system of two

(a). Calculate the potential energy of a system of two small spheres, one carrying a charge of 2.00 µC and the other a charge of -3.50 µC, with their centers separated by a distance of 0.180 m. Assume...

Q: The charge center of a thundercloud, drifting 3.0 km

The charge center of a thundercloud, drifting 3.0 km above the earth’s surface, contains 20 C of negative charge. Assuming the charge center has a radius of 1.0 km, and modeling the charge center and...

Q: A Geiger counter detects radiation such as alpha particles by using the

A Geiger counter detects radiation such as alpha particles by using the fact that the radiation ionizes the air along its path. A thin wire lies on the axis of a hollow metal cylinder and is insulated...

Q: The inner cylinder of a long, cylindrical capacitor has radius ra

The inner cylinder of a long, cylindrical capacitor has radius ra and linear charge density +λ. It is surrounded by a coaxial cylindrical conducting shell with inner radius rb and linear...

Q: A parallel-plate capacitor has square plates that are 8.

A parallel-plate capacitor has square plates that are 8.00 cm on each side and 3.80 mm apart. The space between the plates is completely filled with two square slabs of dielectric, each 8.00 cm on a s...

Q: Three square metal plates A, B, and C, each

Three square metal plates A, B, and C, each 12.0 cm on a side and 1.50 mm thick, are arranged as in Fig. P24.67. The plates are separated by sheets of paper 0.45 mm thick and with dielectric constant...

Q: A thin insulating rod is bent into a semicircular arc of radius

A thin insulating rod is bent into a semicircular arc of radius a, and a total electric charge Q is distributed uniformly along the rod. Calculate the potential at the center of curvature of the arc i...

Q: Two plastic spheres, each carrying charge uniformly distributed throughout its interior

Two plastic spheres, each carrying charge uniformly distributed throughout its interior, are initially placed in contact and then released. One sphere is 60.0 cm in diameter, has mass 50.0 g, and cont...