Electric Circuits Answers

A section of iron wire having a diameter of 0.030 inch is measured to have a resistance of

2500

Ω (at a temperature of 20°C).

a. Determine the cross

-sectional area in square meters and in square millimeters.

(Note: 1 inch = 2.54 cm = 25.4 mm)

b. Calculate the length of the wire in meters.

two charges Q1=+3nC and Q2=-5nC are separated by a distance of 6cm and 2cm for point A amd 2cm and 10cm for point B (a) Calculate the electric potential at point A and point B.

(b) How much work is done by the electric field in a moving 4.00nC particle from point A and point B.

How will you define a smart city? Is the characteristics of a smart city similar to smartphones? In what way(s)?

Is it possible to build a smart grid in the Philippines? What necessary actions are needed to fulfill this goal?

Two identical point charges, 10 cm apart in air, repel each other with a force of 1 newton. Find the magnitude of each charge.

What is the force between an electron and a proton if they are 1.0x10-8cm?

What is the force between two electrons 1.0 centimeter apart in air?

two point charges are located on the positive x axis of a coordinate system charge q1=1.0nC is 2.0cm from the origin, another charge q2=-3.0nC os 4.0cm from the origin .what is the total force exerted by these two charges on charge q3=5.0nC located at The origin

A current of 10 A flows through a conductor and 10w is dissapted,what p.d exist across the end of the conductor

4 

A voltmeter which is connected across a lightbulb in a circuit, reads 2V.  Consider the following: 

For every one coulomb of charge flowing through the bulb: 

1. 2J of heat and light is liberated 
2. The potential energy decreases with 2J 
3. The potential energy increases with 2J 

1. i and ii 
2. i and iii 
3. ii and iii 
4. i, ii, and iii 

The magnitude of the electric current in a circuit will definitely increase if 

1. more cells are in parallel 
2. the resistors are connected in parallel 
3. the cells are connected in parallel and the resistors in series 
4. Both the cells and resistors are connected in parallel