## Presentation ~ above theme: "QUICK QUIZ 15.1 If a suspended thing A is attractive to thing B, i m sorry is charged, we have the right to conclude the (a) thing A is uncharged, (b) thing A is charged,"— Presentation transcript:

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1 rapid QUIZ 15.1 If a suspended object A is attracted to object B, which is charged, we have the right to conclude the (a) object A is uncharged, (b) thing A is charged, (c) thing B is positive charged, or (d) object A might be either charged or uncharged. 2 rapid QUIZ 15.1 answer (d). Object A could possess a net charge whose authorize is opposite that of the excess charge on B. If thing A is neutral, B would also attract it by developing an induced charge on the surface ar of A. This case is depicted in number 15.5 that the textbook. 3 rapid QUIZ 15.2 thing A has a fee of +2 µC, and object B has actually a charge of +6 µC. I m sorry statement is true: (a) FAB = –3FBA, (b) FAB = –FBA, or (c) 3FAB = –FBA 4 quick QUIZ 15.2 answer (b). Through Newton’s 3rd law, the two objects will exert forces having equal magnitudes however opposite direction on every other. 5 quick QUIZ 15.3 A test fee of +3 µC is at a allude P wherein the electric field because of other charges is command to the right and has a magnitude of 4  106 N/C. If the test charge is replaced with a –3 µC charge, the electric field at p (a) has actually the same magnitude but changes direction, (b) boosts in magnitude and also changes direction, (c) stays the same, or (d) reduce in magnitude and also changes direction. 6 quick QUIZ 15.3 answer (c). The electric field at point P is because of charges various other than the test charge. Thus, that is unchanged when the test fee is altered. However, the direction the the pressure this field exerts ~ above the test adjust is reversed once the sign of the test fee is changed. 7 fast QUIZ 15.4 A Styrofoam ball spanned with a conducting paint has actually a fixed of 5.0 ´ 10-3 kg and also has a charge of 4.0 C. What electrical field directed upward will create an electrical force ~ above the ball that will balance the load of the ball? (a) 8.2 ´ 102 N/C (b) 1.2 ´ 104 N/C (c) 2.0 ´ 10-2 N/C (d) 5.1 ´ 106 N/C 8 rapid QUIZ 15.4 prize (b). The size of the upward electrical force need to equal the load of the ball. The is: qE = mg, for this reason = 1.2 × 104 N/C 9 quick QUIZ 15.5 A circular ring the radius b has actually a full charge q uniformly distributed about it. The magnitude of the electrical field at the center of the ring is (a) 0 (b) keq/b2 (c) keq2/b2 (d) keq2/b (e) none of these. 10 quick QUIZ 15.5 prize (a). If a test charge is at the center of the ring, the force exerted ~ above the test fee by fee on any small segment that the ring will certainly be well balanced by the force exerted by charge on the diametrically the contrary segment the the ring. The net force on the check charge, and also hence the electric field in ~ this location, need to then be zero. 11 rapid QUIZ 15.6 A "free" electron and also "free" proton are put in an identical electric field. I m sorry of the complying with statements room true? (a) Each particle experiences the same electric force and also the very same acceleration. (b) The electrical force ~ above the proton is better in magnitude than the force on the electron but in opposing direction. (c) The electric force on the proton is same in size to the pressure on the electron, however in the opposite direction. (d) The size of the acceleration of the electron is greater than the of the proton. (e) Both particles suffer the exact same acceleration. 12 rapid QUIZ 15.6 answers (c) and (d). The electron and also the proton have actually equal magnitude charges of the opposite signs. The pressures exerted on this particles through the electric field have actually equal magnitude and opposite directions. The electron experiences an acceleration of greater magnitude than does the proton due to the fact that the electron’s mass is lot smaller 보다 that that the proton. 13 rapid QUIZ 15.7 rank the magnitudes that the electric field at points A, B, and C in number 15.15, biggest magnitude first. 14 quick QUIZ 15.7 answer A, B, and also C. The field is biggest at suggest A because this is where the ar lines are closest together. The absence of lines at point C suggests that the electrical field over there is zero. 15 fast QUIZ 15.8 for a surface through i beg your pardon the network flux is zero, the following four statements could be true. Which of the statements need to be true? (a) There room no charges within the surface. (b) The net fee inside the surface ar is zero. (c) The electrical field is zero everywhere on the surface. (d) The variety of electric field lines beginning the surface equates to the number leaving the surface. 16 fast QUIZ 15.8 answer Statements (b) and (d) room true and follow native Gauss’s law. Declare (a) is no necessarily true since Gauss’s legislation says the the net flux through any kind of closed surface equates to the net charge inside the surface separated by ε0. Because that example, a positive and a negative charge can be within the surface. Explain (c) is no necessarily true.

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Back the net flux with the surface ar is zero, the electrical field in that region may not be zero. 