Questions from Modern Physics

Q: When a capacitor, battery, and resistor are connected in series

When a capacitor, battery, and resistor are connected in series, does the resistor affect the maximum charge stored on the capacitor? Why or why not? What purpose does the resistor serve?

Q: In the circuit shown in Fig. Q28.13, when

In the circuit shown in Fig. Q28.13, when switch S is suddenly closed, the wire L is pulled toward the lower wire carrying current I. Which (a or b) is the positive terminal of the battery? How do you...

Q: Show that the units A ∙ m2 and J/T for

Show that the units A ∙ m2 and J/T for the Bohr magneton are equivalent.

Q: If a magnet is suspended over a container of liquid air,

If a magnet is suspended over a container of liquid air, it attracts droplets to its poles. The droplets contain only liquid oxygen; even though nitrogen is the primary constituent of air, it is not a...

Q: What features of atomic structure determine whether an element is diamagnetic or

What features of atomic structure determine whether an element is diamagnetic or paramagnetic? Explain.

Q: For the same magnetic field strength B, is the energy density

For the same magnetic field strength B, is the energy density greater in vacuum or in a magnetic material? Explain. Does Eq. (30.11) imply that for a long solenoid in which the current is I the energy...

Q: Streams of charged particles emitted from the sun during periods of solar

Streams of charged particles emitted from the sun during periods of solar activity create a disturbance in the earth’s magnetic field. How does this happen?

Q: The text discussed the magnetic field of an infinitely long, straight

The text discussed the magnetic field of an infinitely long, straight conductor carrying a current. Of course, there is no such thing as an infinitely long anything. How do you decide whether a partic...

Q: Two long, straight, parallel wires, 10.0 cm

Two long, straight, parallel wires, 10.0 cm apart, carry equal 4.00-A currents in the same direction, as shown in Fig. E28.23. Find the magnitude and direction of the magnetic field at Fig. E28.23:...

Q: Pairs of conductors carrying current into or out of the power-

Pairs of conductors carrying current into or out of the power-supply components of electronic equipment are sometimes twisted together to reduce magnetic-field effects. Why does this help?