Electric Circuits Answers

A metal ball is supported on an insulating stand. You wish to place a positive charge on the ball, but you have only an object that carries a negative charge. Explain how you could accomplish your aim.

At the center of a cube of edge 80.0cm, a charge of 170 µC is found. (1 µC = 10^-6 Coulombs) (Permittivity  

    of free space (ϵ₀) 8.85x10^-12 C² / N.m²)

You are to construct a parallel plate capacitor out of two flat plate of area 25 cm^2. You

have three dielectrics to choose from: 1 cm thick paraffin, 2 cm thick Pyrex glass, and 3 cm thick Porcelain which of the dielectric will you used to get the maximum capacitance?

. Dry air will support a maximum electric field strength of about 2.0 x 108 V/m. Above that value, the field creates enough ionization in the air to make the air a conductor. This allows a discharge or spark that reduces the field. What, then, is the maximum voltage between two parallel conducting plates separated by 3.5 cm of dry air?

4. In the circuit shown on the right, the rate at which R1

dissipating electrical energy is 20.0W.

(a) Find R1 and R2.

(b) What is the emf of the battery?

(c) Find the current through both R2 and the 10.0-Ω

resistor.

(d) Calculate the total electrical power consumption in all

the resistors and the electrical power delivered by the battery

3. A triangular array of resistors is shown in the figure on the

right. What current will this array draw from a 35.0V battery

having negligible internal resistance if we connect it across

a.) ab;

b.) bc and

c.) ac?

The circuit in the figure on the right shows a network of resistors

connected in series and in parallel.

(a) Determine the total resistance of the network.

(b) What is the current through the 3.00-Ω?

A charged Q of 2.5uC is in two dimensional electric field with horizontal and vertical components of 35.0 N/C and 52.0 N/C, respectively. Find the magnitude and direction of the electric force on charge Q.

Two point charges q₁ = +2 N.C and q₂= -3N.C are separated in air. Where is the neutral point?

2. The capacitors have values C₁ = 2.0 μF and C₂ = 4.0 μF, C₂ = 5.0 μF C4 = 7.0 μF and the potential difference across the battery is 9.0 V. Assume that the capacitors are connected in series.

a) Find the equivalent capacitance of the circuit.

b) Solve for the potential difference across each capacitors.

3. Given the same problem in #2. Assume that the capacitors are connected in parallel.

a) Find the equivalent capacitance of the circuit.

b) Solve for the charge across each capacitors.