Capacitors in combination: The network shown in the figure is assembled with uncharged capacitors X, Y, and Z, with

Resistors in combination: A resistor is made out of a long wire having a length L. Each end of the wire is attached to a terminal of a battery providing a constant voltage V0. A current I flows through the wire. If the wire were cut in half, making two wires of length L/2, and both wires were attached to the battery (the end of both wires attached to one terminal, and the other ends attached to the other terminal), what would be the total current flowing through the two wires?

Capacitors in combination: When two or more capacitors are connected in series across a potential difference,

Eyes: What is the focal length of the corrective contact lens needed by a nearsighted person whose far point is 60 cm?

Field due to circular loop: A ring with a clockwise current (as seen from above the ring) is situated with its center directly above another ring, which has a counter-clockwise current, as shown in the figure. In what direction is the net magnetic force exerted on the top ring?

Compound microscope: The eyepiece of a compound microscope has a focal length of 2.50 cm and the objective has a focal length of 1.60 cm. The two lenses are separated by 15.0 cm. The microscope is used by a person with normal eyes (near point at 25 cm). What is the angular magnification of the microscope?

Force on parallel wires: The figure shows three long, parallel current-carrying wires. The magnitudes of the currents are equal and their directions are indicated in the figure. Which of the arrows drawn near the wire carrying current 1 correctly indicates the direction of the magnetic force acting on that wire?

Eyes: What power contact lens must be used to correct the vision of a nearsighted person whose far point is 40 cm?

Lenz’s law: The figure shows a bar magnet moving vertically upward toward a horizontal coil. The poles of the bar magnets are labeled X and Y. As the bar magnet approaches the coil it induces an electric current in the direction indicated on the figure (counter-clockwise as viewed from above). What are the correct polarities of the magnet?

Capacitors in combination: When two or more capacitors are connected in parallel across a potential difference,