Questions from Modern Physics

Q: If magnetic monopoles existed, the right-hand side of Eq

If magnetic monopoles existed, the right-hand side of Eq. (29.20) would include a term proportional to the current of magnetic monopoles. Suppose a steady monopole current is moving in a long straight...

Q: A type-II superconductor in an external field between Bc1 and

A type-II superconductor in an external field between Bc1 and Bc2 has regions that contain magnetic flux and have resistance, and also has superconducting regions. What is the resistance of a long, th...

Q: For Eq. (29.6), show that if v

For Eq. (29.6), show that if v is in meters per second, B in teslas, and L in meters, then the units of the right-hand side of the equation are joules per coulomb or volts (the correct SI units for E)...

Q: A long, straight conductor passes through the center of a metal

A long, straight conductor passes through the center of a metal ring, perpendicular to its plane. If the current in the conductor increases, is a current induced in the ring? Explain.

Q: An airplane is in level flight over Antarctica, where the magnetic

An airplane is in level flight over Antarctica, where the magnetic field of the earth is mostly directed upward away from the ground. As viewed by a passenger facing toward the front of the plane, is...

Q: In an electric trolley or bus system, the vehicle’s motor draws

In an electric trolley or bus system, the vehicle’s motor draws current from an overhead wire by means of a long arm with an attachment at the end that slides along the overhead wire. A brilliant elec...

Q: In Section 30.5 Kirchhoff’s loop rule is applied to an

In Section 30.5 Kirchhoff’s loop rule is applied to an L-C circuit where the capacitor is initially fully charged and the equation -L (di/dt) – (q/C) = 0 is derived. But as the capacitor starts to dis...

Q: In Section 30.5 the relationship i = dq/dt

In Section 30.5 the relationship i = dq/dt is used in deriving Eq. (30.20). But a flow of current corresponds to a decrease in the charge on the capacitor. Explain, therefore, why this is the correct...

Q: In the R-L circuit shown in Fig. 30.

In the R-L circuit shown in Fig. 30.11, when switch S1 is closed, the potential vac changes suddenly and discontinuously, but the current does not. Explain why the voltage can change suddenly but the...

Q: Three resistors having resistances of 1.60 Ω, 2.

Three resistors having resistances of 1.60 Ω, 2.40 Ω, and 4.80 Ω are connected in parallel to a 28.0-V battery that has negligible internal resistance. Find (a). the equivalent resistance of the comb...