A -10.0 nC point charge and a +20.0 nC point charge are 15.0 cm apart on the x-axis.

Part A)

What is the electric potential at the point on the x-axis where the electric field is zero? Answer in V

Part B)

What is the magnitude of the electric field at the point on the x-axis, between the charges, where the electric potential is zero? Answer in N/C

What are the drift speeds of Li+, Na+, and K+ in water when a potential difference of 10 V is applied across a 1.00 cm conductivity cell? How long would it take an ion to move from one electrode to the other? In conductivity measurements it is normal to use alternating current: what are the displacements of the ions in centimeters during a half cycle of 1.0 kHz applied potential.

Suppose you made a copper-nickel cell where the copper was the cathode and the nickel was the anode. You add a 0.5000 M solution of copper nitrate on the cathode side and a 3.000 M solution of nickel nitrate on the anode side. What is the voltage of the cell under these conditions? The units are volts and use at least 4 significant digits in the answer. The error interval is 0.02 V.

In a buck converter, consider all components to be ideal. Let v0 = Vo be held constant at 5 V by controlling the switch duty ratio d. Calculate the minimum inductance L required to keep the converter operation in a continuous-conduction mode under all conditions if input voltage Vin ranges from 10 to 40V, and output P0 ≥ 5W and fs = 50kHz.

(a) Calculate the equilibrium constant for the following reaction at 25°C: Ag+(aq) + Fe2+(aq) Ag(s) + Fe3+(aq) The standard cell potential of the corresponding voltaic cell is 0.030 V. (b) When equal volumes of 1.3 M solutions of Ag+ and Fe2+ are mixed, what is the equilibrium concentration of Fe2+? Ag+(aq) + Fe2+(aq) Ag(s) + Fe3+(aq)

The piston cylinder contains 4 kg of saturated water vapor with 200 kPa. The heat is rejected from the water, and the piston moves from the stops when the pressure reaches 100 kPa. Then the heat is rejected until the total volume decrease to 30% from the initial volume. Determine the work done and heat transfer during this process, show the process on a P-V diagram.

In the electron gun of a TV picture tube the electrons (charge ?e, mass m) are accelerated by a voltage V. After leaving the electron gun, the electron beam travels a distance D to the screen; in this region there is a transverse magnetic field of magnitude B and no electric field.

Find the approximate deflection of the beam due to this magnetic field. (Hint: Place the origin at the center of the electron beam

A parallel-plate capacitor has capacitance 4.50 μF.

(a) How much energy is stored in the capacitor if it is connected to a 8.00-V battery?
μJ

(b) If the battery is disconnected and the distance between the charged plates doubled, what is the energy stored?
μJ

(c) The battery is subsequently reattached to the capacitor, but the plate separation remains as in part (b). How much energy is stored?
μJ

Two point charges Q₁ = +4.00 nC and

Q₂ = −2.70 nC

are separated by 55.0 cm.

(a) What is the electric potential at a point midway between the charges?
V

(b) What is the potential energy of the pair of charges?
J

What is the significance of the algebraic sign of your answer?

Positive work must be done to separate the charges.Negative work must be done to separate the charges.