29/03/2020 Electric Fields and Capacitance(Senior Class Physics Study by Topics) 29/03/2020 0Comments by Gate Academy Welcome to your Electric Fields and Capacitance(Senior Class Physics Study by Topics) NAME EMAIL PHONE NUMBER 1. The total capacitance is 1/9 micro farad 3 micro Farad 9 micro Farad 1/3 micro farad 2. The following are ways to charge an object except? Conduction Friction Induction Sendorction 3. A very small ball has a mass of 5.0e-3 Kg and a charge of 4 uC. What magnitude electric field directed upward will balance the weight of the ball? 1.2e4 N/C 3.7e3 N/C 8.2e2 N/C 2.0e-2 N/C 4. A uniform electric field of 1.0 N/G is set up by a uniform distribution of charge in the xy plane. What is the electric field inside a metal ball placed 0.5 m above the xy plane ? 0 -1.0 N/C It varies 0.25 N/C 5. A capacitance of 0.033 µF is the same as which of the following? 33 pF 33,000 pF 3300 pF 330 pF 6. What is the voltage required to store 72 micro Coulomb of charge on the plates of a 6.0 micro farad capacitor? 6 V 10 V 12 V 8 V 7. When drawing field lines, the lines should always cross. False True 8. If charge stored on plates of capacitors is large, then capacitance will be zero large small infinite 9. The main advantage of air as a dielectric material for capacitors is the fact that it Is not physically dense. Has a high dielectric constant. Has low loss. Allows for large capacitance in a small volume. 10. One micro Farad is equal .................... Farad 0.0000001 F 0.00001 F 0.001 F O.1 F 11. Charges of 3.0 nC,-2.0 nC, -7.0 nC, and 1.0 nC are contained inside a rectangular box with length 1.0 m, width 2.0 m, and height 2.5 m. Outside the box are charges of 1.0 nC and 4.0 nC. What is the electric flux through the surface of the box? 0 260 -340 -560 12. A capacitor of capacitance 2000 micro Farad is connected to a 12 volt battery. What is the charge on the Capacitor? 0.024 Coulomb 0.064 Coulomb 0.012 Coulomb 0.034 Coulomb 13. Suppose that a capacitor is rated at 33 pF 10%. Which of the following actual capacitance values is outside the acceptable range? 37 pF 31 pF 35 pF 30 pF 14. A capacitance of 100 pF is the same as which of the following? 0.001 µF 0.01 µF 0.0001 µF 0.00001 µF 15. Which of the following capacitance values is most typical of a paper capacitor? 0.01 µF 100 µF 3300 µF 0.001 pF 16. Figure shows three capacitors connected in parallel. Find the effective capacitance 400 micro Farad 200 micro Farad 100 micro Farad 300 micro Farad 17. An electron with a speed of 3.00 x 106m/s moves into a uniform electric field of magnitude 1.00 x 10³ N/C. The field lines are parallel to the electron's velocity and pointing in the same direction as the velocity. How far does the electron travel before it is bought to rest 4.24 m 3.34 m 5.12 cm 2.56 cm 18. Phenomena in which a body attract uncharged body is known as charge movement electric current electrostatic induction magnetic induction 19. The capacitors stores energy in the form of Electric field Non of the above Both magnetic and Electric field Magnetic field 20. Can you tell if an object is negatively charged or positively charged with an electroscope? Sometimes, if you look closely. No, because the electroscope behaves the same way Yes, because electroscopes behave differently. Yes, because you can find out by checking the rim. 21. The parts of a Capacitor are Metal Plates and Dielectric Metal Plates and Charges All of the above One Dielectric and two metal plates 22. Suppose that three capacitors are in parallel. Their values are 0.0200 µF, 0.0500 µF, and 0.10000 µF. What is the net capacitance of this combination? 0.0125 µF 0.1000 µF 0.1250 µF 0.1700 µF 23. Capacitance and charged on plates are always equal directly related inversely related not related at all 24. Field lines start on positive charges and end on negative charges. False True 25. Do atoms have a charge? Sometimes No Yes Maybe 1 out of 25 Time is Up! Time's up