Voltage on a capacitor

A 12.5 micro Farad capacitor is charged by a 150 volt battery and then is disconnected from the battery. When this capacitor (C1) is then connected to a second (uncharged) capacitor, the voltage on C1 drops to 10 volts. What is the value of C2? (I need a very detailed solution, with every micro-step detailed)

For resistors in parallel configuration, the equivalent resistance is always smaller than the smallest resistor.

Prove: For resistors in parallel configuration, the equivalent resistance is always smaller than the smallest resistor.

Electromagnatism Induction

A metal bar with length L, mass m, and resistance R is placed on frictionless, metal rails that are inclined at an angle (Data) above the horizontal. The rails have negligible resistance. A uniform magnetic fiels of magnitude B is directed downward. The bar is released from rest and slides down the rails. a) Is the direction ...continues

Inductance of a short coil

Have the inductance of the long coil which is L=( Meu (not)* N^2 * A ) / (D) A = Area , D = Length , N = number of turns in the coil Need to prove that for a short coil the inductance (L) is the following: L =[( Meu (not)* N^2 * A ) / (D)] * [ [{(D^2 - a^2)^(1/2)} - a ] / (D)] ] a = radius of the coil A = 3.14 a^2

describe how radio waves are converted to audible sound

Please explain how radio waves are converted to audible sound waves. A diagram would be helpful in the explanation.

Charge and coulombs law

Please see attached diagrams for problem and question, thanks.

Charge and potential energy

two dust particles each of mass 13 ug (10^-6) are floating on a gentle stream of air. what (equal) positive charge would each dust particle have to carry in order that their electrostatic repulsion should exactly balance their gravitational attraction? what is the electrostatic potential energy of the two dust particles each ...continues

Magnetic field from two infinitely long wires

Two wires of infinite length are placed at a distance D = 10cm on opposite sides of a point O, both wires carry the same current of 1.0 A, in which direction must this current flow in order for the magnetic field strength at O to be non-zero. Consider a general point on the line joining the 2 wires and a distance d away from ...continues

Help determine line-to-line voltage of a circuit.

If the line-to-neutral voltage in a three-phase Y-connected circuit is 240 volts, determine the line-to-line voltage.

Comparison of conductivity of probes in a saline solution

Probes were part way inserted through the lid of a jar containing weak saline solution. The jar containing the solution was heated through different temps. and the conductivity of the metal probes compared. Should there be attention paid to pressure (inside the jar) when trying to establish the difference in conductivity of th ...continues