III. LEARNING TASKS: A. Practice Task 1. Draw the electric field lines in the following situations 1. Two negative charges 2. Two opposite charges (one positive, one negative) B. Practice Task 2. Solve the problem below. You may use a separate sheet of paper to show your complete solution. Point charges q1= +12 nC and q2= -12 NC are 0.100 m apart. (Such pairs of point charges with equal magnitude and opposite sign are called electric dipoles.) Compute the total field at point b. IV. GENERALIZATION: Solve the problem below. You may use a separate sheet of paper to show your complete solution. In the diagram, q,=+4.50x10 C, q2=-3.25X10 C and q3+3.73X10"C. Charges 1 and 2 are separated by 3.00 cm and charges 1 and 3 are separated by 1.50 cm. The constant in Coulomb's Law, k, is 9 X10" N m /C?. 1. Determine the net electric force acting on q1- 2. Compute the total electric field at q1. V. EVALUATION: Direction: Answer the following questions. Read the questions carefully and select the letter of the best answer. 1. What is the conventional direction of electric field is? a) Positive to negative b) Negative to positive c) No specific direction ") Direction cannot be determined 2. Where does electric field originate? a) Positive charge b) Negative charge ) Neither positive nor negative d) Both positive and negative 3. Where does electric field terminate/ end? a) Positive charge b) Negative charge c) Neither positive nor negative d) Both positive and negative 4. Which among the following statements is true with regard to electric field lines? a) Electric field lines always intersect b) Electric field lines may or may not intersect ) Electric field lines can be seen d) Electric field lines never intersect 5. Which, among the following, is the field where electric charge experiences a force? a) Electric field b) Magnetic field ) Gravitational field d) Electric, magnetic and gravitational field 6. Which, among the following is the correct expression for an electric field? a) E=F/C b) E=F*C C) E=F/Q d) E=F*Q 7. In order to compute for electric field, we can utilize any of these two: a) electric force and gravitational force b) Coulomb's law and superposition principle c) Coulomb's constant and superposition principle d) Coulomb's force and coulomb's constant 8. At which point is the electric field strongest? 3 /4 a) A b ) B c) C d) D 9. Which of the following represents the electric field map due to a single positive charge? 10. What is the electric field due to a point charge of 2.00 nC (nano-Coulombs) at a distance of 5.00 mm from the charge? A. 4.50X105 N/C C. 7.20X105 N/C B. 6. 40X105 N/C D. 8.30X105 N/C Note: Dis m STEM-G neral Physics 2 - Grade 12 Module 3: Electric Field. VI. REMARKS: In this part, you can tell your teacher what confused you, what part did you find difficult or what you learned about.III. LEARNING TASKS: A. Practice Task 1. Solve the problem below. Show your complete solution. A uniform electric field of 10 N/C passed perpendicularly through a surface area of 2 x 104 cm2. Compute for the magnitude of the electric flux. Given: Find: Solution: B. Practice Task 2. Solve the problem below. You may use a separate sheet of paper to show your complete solution. A disk of radius 0.10m is oriented with its normal unit vector at 30 to a uniform electric field E of magnitude 2.0 x 103 N/C. 1. What is the electric flux through the disk? " - 0.10m 2. What is the flux through the disk if the normal unit vector is perpendicular to E? 3. What is the flux through the disk if the normal unit vector is parallel to E? V. GENERALIZATION: Based on the figure below, explain how each of the following factors affect electric flux. 3. Magnitude of the uniform of the electric field (density of the flow) 2. Orientation of the surface area with respect to the E 1. Area of the surface V. EVALUATION: Direction: Answer the following questions. Read the questions carefully and select the letter of the best answer. 1. What is an electric flux? a. It is space around a charge where electric force acts. b. It refers to the total number of electric lines of force passing through a surface area. C. It refers to the attractive or repulsive force acting between charges. d. It is the line of electric force drawn from a point charge. 2. Which of the following equations is used to calculate electric flux? a. DE = = cos e C. DE = E. A cos e b. DE = = cose d. DE = q' A cos e 3. In which situation electric flux is at maximum? a. A surface area is placed face to face to the electric field. . A surface area is parallel to the electric field. c. Electric field line passing through an area inclined at 450. d. Electric field lines coming from a box with charges of equal magnitude but opposite signs. 4. An electric field of 30 N/C passes face to face through a surface area of 1 m2. What is the electric flux? a. ONmy/C c. 20 Nmy/C b. 10 Nm2/C d. 30 Nm2/C 5. An electric field of 30 N/C passes parallel through a surface area of 1 m2. What is the electric flux? a. ONmyC C. 20 Nmy/C . 10 Nm /C d. 30 Nm2/C For numbers 6-7, study the diagram below. Diagram A Diagram B Diagram C 3/4 6. Which diagram has the maximum magnitude of electric flux? a. Diagram A b. Diagram B c. Diagram C 7. Which diagram has zero electric flux? b. Diagram A b. Diagram B c. Diagram C 8. A uniform electric field of 40 N/C passes through a flat surface of 1 m2. The angle between E and A is 90. The diagram is shown below. Determine the electric flux. . 0 Nm /C C. 40 Nm2/C b. 35 Nm /C d. 50 Nm?/C 9. A uniform electric field of 40 N/C passes through a flat surface of 1 m2 The diagram is shown below. Determine the electric flux a. ONmy/C c. 40 Nm2/C 35 Nm20 1. 50 Nm /C 10. A uniform electric field of 40 N/C passes through a flat surface of 1 m2. The surface is oriented at an angle of 30 as shown in the diagram. Determine the electric flux. a. ONmy/C C. 40 Nm2/C b. 35 Nm /C d. 50 Nm2/C Note: Discussions and word problems presented in this material are from STEM-General Physics 2 - Grade 12 Module 4: Electric Flux and University Physics VI. REMARKS: In this part, you can tell your teacher what confused you, what part did you find difficult or what you learned about.lll. LEARNING TASKS: A. Practice Task 1. Analyze the illustration The figure shows the field produced by two point charges +q and -q (electric dipole). Find the electric flux through each of the closed surfaces A. B. C, and D. You may use a separate paper for your answer. 3. Practice Task 2. Solve the problem below. You may use a separate sheet of paper to show your complete solution. You measure an electric field 1.25 x 10" N16 of at a distance of 0.150 m from a point charge. There is no other source of electric field in the region other than this point charge. What is the magnitude of this charge? Given: Find: Solution: W. GENERALIZATION: Test your understanding. The figure shows six point charges that all lie in the same plane. Five gaussian surfaces Sr, 52. 53. S. and 55 each enclose part of this plane. Rank these ve surfaces in order of the electric flux through them, from most positive to most negative, You may use a separate sheet of paper to show your solution. V. EVALUATION: Direction: Answer the follow'ng questions. Read the questions carefully and select the letter of the best answer. 1. Shown in the figure are three concentric spherical Gaussian surfaces A. B. and C with a positive point charge +Q at their center. A second. but negative point charge Q is enclosed only by surface C. Which is a correct statement about the magnitudes of the electric flux dis through the three 60 surfaces? a. o. =B= oc , b.A=B>-c E" c. an > (DB > itnc d. dis > 41,, > dac 2. An uncharged. nonconducting, hollow sphere of radius 10.0cm surrounds a 10.0nC charge located at the origin of a Cartesian coordinate system. What is the magnitude of the electric flux through the surface of the sphere? a. 1.11x105N-m2/C c.1.11x10'5N-m2/C b. 1.13x103 N-m2/C d. 1.]3x10'3N-m2/C 3. What is the net electric flux through the spherical closed surface shown in the figure? The two charges on the right are inside the spherical surface? 0 \"an\"; a. 225.8)(103 N - m2/C +2.00 MI 0 b. 255.8)(103 N - mz/C -5.m' c. 225.8 N - m2/C d. 255.8N-m2/C 4. The charge per unit length on a long, straight filament is 90.0pC/m. What is the magnitude of the electric field 10. 0 cm from the filament. where distances are measured perpendicular to the length of the filament? a. 16x 10 N/C c.16 x 103 N/C b. 16x10N/C d. 1tS.it1(}3 MC 5. What is the electric field due to an infinite plane of positive charge with uniform surface charge density 120 uC/cmz. a. 6.78 x 10' MC c. -6.78 x 10\" MC b. 6.78): 106 N/C d. 6.78 x 10" N/C Note: Discussions and mmnmsermmm rnam'afmhom STEM-GemiaiPhysics2- Grade IZWS'GOUSS'SLMW University Physics' VI. REMARKS: In this part, you can tell your teacher what confused you, what pan did you find difficult or what you learned about