Two particles with positive charges and are both at rest and are very far apart. How much work would be done by external forces to bring the particles to rest at a distance apart?

The circuit represented in the diagram above contains four resistors and a battery. The 45-V battery has a 1-Ω internal resistance. How much energy is dissipated by the batteries internal resistance in 60 seconds? The battery with internal resistance is shown in a dashed box at the bottom. From the left side, a wire connects to a horizontal resistor labeled R sub 1 equals 8 ohms, then branches up and down to two resistors: R sub 2 equals 6 ohms on the top path and R sub 3 equals 12 ohms on the bottom path. These branches rejoin and connect to a resistor labeled R sub 4 equals 2 ohms on the right side before returning to the battery.

Two capacitors of 4 μF and 8 μF are connected in parallel. What is the equivalent capacitance of this system?

The middle sections of too long, straight wires are each bent into semicircular shapes. The two wires are placed close to each other in a plane as shown above. Point A is the center of the circle formed by the two wires. There is a current in each wire. Which of the following best represents the direction of the magnetic field, if any, at point A due to the currents?

Find the charge of a 2 μF  capacitor charged to 100 V.

How much energy is stored in a 1.5 μF capacitor that is connected to a 9.0 V battery?

Electric potential is defined as the _________________________.

If more resistors are added in series to a battery with zero internal resistance, the power supplied by the source ___________.

The 500 gram mass carries a charge of . If the coefficient of friction between the mass and the surface is 0.20, and an electric field of magnitude  is horizontal and directed to the right, which is being treated as the positive x-direction. What is the acceleration of the mass?

A long, straight wire carries a current of 5.0 A. At what distance from the wire is its magnetic field ?