Electric Circuits Answers

you are working at a company that manufactures electrical wire. Gold is the most ductile of all metals: it can be streched into incredibly long, thin wires. the company has developed a new technique that will stetch 1.00 g of gold into a wire of length L=2.40 km amd uniform diameter.your supervisor gives you the task of determining the resistance of such a wire at 20.0 degrees celcius.

an electric current in a conductor varies with time according to the expression I(t) = 100 sin (120pi*t), where I is in amperes and t in seconds. what is the total charge passing a given point in the conductor from t=0 to t=1/240s?

a copper wire has a circular cross section with a radius of 1.25 mm. a) if the wire carrries a current of 3.70 A, FIND THE DRIFT SPEED OF THE ELECTRONS in this wire. b)all other things being equal what happens to the drift speed in wires made of metal having a larger number of conduction electrons per atom than copper ? Explain

State with reasons whether the following statements are True or False.
i) Optical fibre is an ideal medium for microwave transmission.
ii) Adding redundant bit in a transmitted signal ensures error free communication.
iii) A transmission line with infinite VSWR is ideal for signal transmission.

A cell of e.m.f E and internal resistance, r, was connected in series with two external resistors X and Y of 2Ω and 3Ω respectively. A high - resistance voltmeter connected across Y reads 1.0 V. When another resistor of 2Ω was connected parallel to X the voltmeter read 0.4 V. Calculate the e.m.f and internal resistance of the cell

Two charges are placed on the x-axis. One charge (q1 =+8.5 µC) is at x1 = +3.0 cm and the other (q2 = -21 µC) is at x2 = +9.0 cm. Find the net electric field (magnitude and direction) at x = +6.0 cm.

Suppose the resistance of a copper wire is 2ohms at a temperature of 100degre. Find the resistance of the wire at 0degre and 100degre(temperature coefficient of resistivity of copper wire is 0.00393)

A total charge of 6.3×10−8 C is distributed uniformly throughout a 2.7-cm radius sphere. What is the volume charge density?

In the practical beta was provided with two 1.5 V cells, 3 lamps with different resistance ,3 ammeters,a voltmeter and a switch she was asked to draw a circuit such that: three lamps 1,2 and 3 are connected in parallel. The voltmeter is connected in order to measure the e.m.f of the cell. The ammeters 1,2 and 3 are connected in order to measure the current through lamps 1,2 and 3 respectively. The switch is open to switch of all lamps at the same time.

State the definition of capacitance