Republic of the Philippines
ILOILO SCIENCE AND TECHNOLOGY UNIVERSITY
La Paz, Iloilo City
• Trunkline: (033)320• Website: www.isatu.edu.ph-7190 • Telefax: (033)329-4274
College of Engineering and Architecture
Electronics Engineering Department
Academic Year 2020-2021
Name: Patricia MA. Alexa I. Redaniel
Student #: 2019-2037-A
Course, Year, and Section: BSECE-2B
Date: March 26, 2021
ECE 16 – Electromagnetics
Performance Task #5
Identification Erasures are not allowed (10 pts). Erasures not allowed
1. A tiny imbalance in either positive or negative charge on an object is the cause of Static Electricity.
static electricity
2. Charge of 3 electrons is equal to −𝟒. 𝟖𝟎𝟔 × 𝟏𝟎−𝟏𝟗 𝑪.
-4.806e-19
3. Electric Current is the movement of electric charge through a substance. Current
4. When two neutral objects are rubbed together, charge is transferred from one to the other and the objects become
oppositely charged. This is called Changing by friction. charging by friction
5. The electric field describes as the amount of force per coulomb of charge. electric field
6. The net charge is also sometimes called excess charge. excess charge
7. Mass of 4 neutrons is equal to 𝟔. 𝟕 × 𝟏𝟎−𝟐𝟕 𝒌𝒈. 6.7e-2
8. The electric lines of force in an electric field is also called electric flux. lectric flux
9.
The k parameter in coulomb’s law fomula is equivalent to 𝟖. 𝟗𝟖 × 𝟏𝟎𝟗 𝑵 ∙
𝒎𝟐
𝑪𝟐
8.98e9 N m2/C2
10. An area to be considered in using Gauss law equation Gaussian Surface 7 (C). Gaussian surface7 (C).
True or False. Write your surname if the statement is True, given name if the statement is false (10 pts). Erasures not allowed.
Patrica 1. Any objects cannot lose or gain electric charges. F
Patrica 2. Only negative charges can carry current. F
Patrica 3. The electrons in insulators are free to move—they are loosely bound inside atoms. F
Patrica 4. The force between two charges gets weaker as the charges move closer together. F
Patrica 5. The force between charges directly proportional to the square of the distance between them. F
Redaniel 6. Gravitational forces are far weaker than electric forces. T
Patrica 7. Field lines point toward positive charges. F
Patrica 8.In coulomb’s law, doubling both charges quadruples the force.. F
Patrica 9. In gauss law, the net charge in enclosed area is equivalent to the number of field lines exists.. F
Patrica 10. One electron is equivalent to 1.609 x 10^-19 C. FF
Problem Solving. 30 pts. Write your solutions neat, clean and organize. Emphasize your final answer by putting a box on it.
1.
Two point charges q1= +25nC and q2=-75nC, are separated by a distance of 3.0 cm. Find the magnitude and direction of
the electric force that q2 exerts on q1.
2.
Point charges of 50nC each are located at A(1, 0, 0), B(−1, 0, 0), C(0, 1, 0), and D(0,−1, 0) in free space. Find the total force
on the charge at A.
3.
Point Charges 1 mC and -2mC are located at (3,2,-1) and (-1,-1,4), respectively. Calculate the electric force on a 10 nC charge
located at (0,3,1).
4.
Two point charges are located on the positive x-axis of a coordinate system. Charge q1 = 1.0 nC is 2.0 cm from the origin,
and charge q2 = -3.0 nC is 4.0 cm from the origin. What is the total force exerted by these two charges on a charge q3 =
5.0 nC located at the origin?
5.
In the classical model of the hydrogen atom, the electron revolves around the proton with a radius of 0.53 x 10 -10 m. What
is the magnitude of the electric field due to the proton at r?
6.
Three charges, each equal to +2.90 uC, are placed at three corners of a square 0.500 m on a side, as shown in the diagram.
Find the magnitude and direction of the net force on charge number 3.
7.
Point charge q1 and q2 of +12nC and -12nC respectively, are placed 0.10 m apart. This combination of two charges with
equal magnitude and opposite sign is called an electric dipole. Compute the total electric field at point c.
8.
An electron, initially at rest, is placed in an electric field of 5 x 10 5 N/C directed toward west. What is the acceleration of
the electron due to electric field?
9.
In problem #8, what speed will the electron acquire after moving a distance of 50 cm?
10. Two concentric cylinders of radii 3cm and 6 cm. If the 1.38 x 10^6 N/C radiated outwardly at distance of 4 cm from the
center, what will be the Inner linear charge density assuming outer value is -5 uC/m.
“I can do all things through Christ who strengthened me.” - Philippians 4:13
Instructor: JOMAR A. DADOR, RECE, ME