Three equal charge are at three of the corners of a square of side d. A fourth c
ID: 1599607 • Letter: T
Question
Three equal charge are at three of the corners of a square of side d. A fourth charge of equal magnitude is are the center of the square as shown in Fig. 21-1. Which of the arrows shown represents the net force acting on the charge at the center of the square? A) A b) B c)C d) D e) none of the above 2. Is it possible to have a zero electric field value between two positive charge along the line joining the two charge? a) Yes, if the two charges are equal in magnitude. b) Yes, regardless of the magnitude of the two charges. c) No, a zero electric field cannot exit between the two charges. d) cannot be determined without knowing the separation between the two charges e)cannot be without knowing the magnitude of the charges 3. Kirchhoff's junction rule is a statement of a) the law of conservation of momentum. b) the law of conservation of charge. c) the law of conservation of energy. d) the law of conversation of angular momentum. e) Newton's second law. 4. A ring of negative, uniform charge density is placed on the xz-plane with the center of the ring at the origin. A positive charge moves along the y axis toward the center of the ring. At the moment the charge passes through the center of the ring a) its velocity and its acceleration reach their maximum values. b) its velocity is ,maximum and its acceleration is zero. c) its velocity and its acceleration have non-zero values but neither is at its maximum. d) its velocity and its acceleration are both equal to zero. e) its velocity is zero and its acceleration is maximum. 5. If a charge is located at the center of a spherical volume and the electric flux through the surface of the sphere is Phi 0, what id the flux through the surface if the radius of the sphere doubles? a) 0.125 phi 0 b) 2. Phi 0 c) 5.phi 0 d) 8.phi 0 e) 0.500 phi 0 6. An advantage in evaluating surface integrals related to Gauss's law for symmetric charge distributions is a) the flux is outward. b) the flux is inward. c) the electric is of constant on certain surfaces. d) the charge is always on the surface. e) the electric field is a constant on any surface. 7. A negative charge is moved from point A to B along an surface. Which of the following statements is true for this? a) The negative charge performs work in moving from point A to point B. b) Work is required to move the negative charge from point A to point B. c) Work is both required and performed in moving the negative charge from point A to point B. d) No work is required to move the negative charge from point A to point B. e) Not rough information is given to make a statement about the work involved.Explanation / Answer
1) Force vector C and D will cancel each other, and net force will be across B.
So option b
2) Yes, it can be produced regradless of the two magnitude of the two charges, because the direction of the two fields produced will be opposite to each other.
so option b.
3) Kirchoff's junction rule is a law of conservation of charge.
4) Velocity and acceleration reach their maximum values.