Electric Circuits Answers

Consider the circuit shown (https://imgur.com/a/w76kvp6)

R1 = 18 Ohms P1 = 72 W

R2 = 24 Ohms

R3 = 12 Ohms

R4 = 22 Ohms P4 = 88 W

Consider creating a VIRP table to help organize your information.

A) What is the value of the voltage source?

B) What is the current flowing through R3?

1. Compute the current flowing through a copper wire of cross-sectional area 1.25×10−6 𝑚2 assuming that the drift velocity is 2×10−4 𝑚/𝑠 and the charge carrier density is 1.0×1029/𝑚3.

2. (a) Calculate the resistance per unit length of a 22-gauge Nichrome wire of radius 0.321 mm.

(b) If a potential difference of 10.0 V is maintained across a 1.00 m length of the Nichrome wire, what is the current in the wire?

3. A metal wire of diameter 2 𝑚𝑚 and length 300 𝑚 has a resistance of 1.642 Ω at 20 ℃ and 2.415 Ω at 150 ℃. Find the values of 𝛼0, 𝑅0 and 𝜌20.

A PHY-102 student at Mulungushi University wants to make a simple 10 𝑛𝐹 capacitor for tuning her crystal radio, using two sheets of aluminum foil as plates, with a few sheets of paper between them as a dielectric. The paper has a dielectric constant of 3.0, and the thickness of one sheet of it is 0.20 mm. If the sheets of paper measure 22×28 𝑐𝑚 and she cuts the aluminum foil to the same dimensions, how many sheets of paper would she use between her plates to get the proper capacitance?

A sphere of radius a has a charge + q uniformly distributed throughout its volume.The sphere

is concentric with a spherical shell of inner radius b and outer radius c ,as shown in the diagram.

The shell has a net charge of−q (a)What are the net charged on the inner and outer surfaces of

the shell?(b)Find the expression for the electric field,as a function of radius r, (i) within the

sphere,(ii)between the sphere and the shell(a<r<b),(iii)inside the shell(b<r<c),(iv)outside the

shell(r>c).(c)Find an expression for the capacitance of the system.

A + 35 μC point charge is placed 32 cm from an identical + 35 μC charge. How much work would be required to move a + 0.50μC test charge from a point midway between them to a point 12cm closer to either of the charges?

The scheme of an electrical circuit is represented in the figure. The three resistors are identical, having the electrical resistance R = 60 and an ideal amperemeter A (Ra=0)

The Ampermeter A. indicates the value I = 1A when the K switch is open and the value I'=1,3A when the switch k is closed. Determine:

a. Value of the equivalent resistance of the source outer circuit when the k switch is

closed;

b. The value of inner resistance r of the generator;

c. Electromotive voltage value E. of the generator;

d. The voltage value indicated by an ideal voltmeter (RV → ) mounted instead of the switch.

Charge 1 C is distributed uniformly throughout a spherical insulating shell. The net electric flux in N·m2 /C through the outer surface of the shell is:

Calculate the unknown voltages and currents given in using Ohm’s Law, KVL and KCL.

http://prnt.sc/129b3m1

Where Vs=10 V and all resistances are =1kΩ

When a 360-nF air capacitor is connected to a power supply, the energy stored in the

capacitor is 1.85 𝑥10

−5

𝐽. While the capacitor is kept connected to the power supply, a slab

of dielectric is inserted that completely fills the space between the plates. This increases

the stored energy by 2.32 𝑥10

−5

𝐽. (a) What is the potential difference between the

capacitor plates? (b) What is the dielectric constant of the slab?

1. A 35 𝜇𝐶 point charge is placed 32 𝑐𝑚 from an identical 32 𝜇𝐶 charge. How much work would be required to move a 0.50 𝜇𝐶 charge from a point midway between them to a point 12 𝑐𝑚 closer to either of the charges?

2. Three charges are at the vertices of an isosceles triangle. With 𝑞=7.00 𝑛𝐶, the two charges at the base of the triangle are separated by 2.00 𝑐𝑚 and each have a charge of −𝑞. The charge q at the top of the triangle is 4.00 𝑐𝑚 from each of the charges at the base. Calculate the electric potential halfway between the charges on the base of the triangle.

3. (a) Show that the capacitance of a parallel-plate capacitor is given by the equation

C=EA/D

(b) A 1-megabit computer memory chip contains many 60.0×10−15 𝐹 capacitors. Each capacitor has a plate area of 21.0×10−12 𝑚2. Determine the plate separation of such a capacitor. (Assume a parallel-plate configuration.) The diameter of atom is on the order of 10−10 𝑚 = 1 ˚ 𝐴. Express the plate separation in angstroms.