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 picture shows the symbol of Non of the above Non Polarized Capacitor Variable Capacitor Polarized Capacitor 2. If a capacitor has a negative temperature coefficient, then Its capacitance decreases as the temperature rises. Its capacitance increases as the temperature rises. Its capacitance does not change with temperature. It will not work if the temperature is below freezing. 3. The following are ways to charge an object except? Sendorction Induction Conduction Friction 4. 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 5.12 cm 3.34 m 2.56 cm 4.24 m 5. Two equal charges are separated by a distance d. A third charge placed on a perpendicular bisector at x distance from the centre will experience maximum coulomb force,when x = (d/2√2) X = (d/2) x = (d/√2) X = (d/2√3) 6. A capacitance of 100 pF is the same as which of the following? 0.00001 µF 0.0001 µF 0.01 µF 0.001 µF 7. If charge stored on plates of capacitors is large, then capacitance will be infinite zero large small 8. Two identical metal balls with charges +2Q & -Q are separated by some distance, & exerts a force F on each other. They are joined by a conducting wire, which is then removed. The force between them will now be F/4 F F/2 F/8 9. Work done in charging a capacitor is given by (1/2) QV 2 V QV 2 QV 10. What happens when a charged insulator is placed near an uncharged metallic object? Charge insulator always spontaneously discharges Repel Exert no electrostatic force Attract 11. Figure shows three capacitors connected in parallel. Find the effective capacitance 400 micro Farad 300 micro Farad 100 micro Farad 200 micro Farad 12. Field lines start on positive charges and end on negative charges. False True 13. The unit of capacitance is Fahad Micro Farad Farad Nano Farad 14. What happens when a charged insulator is placed near an uncharged metallic object? Repel Attract Exert no electrostatic force Charge insulator always spontaneously discharges 15. Where are electric field lines equidistant and parallel? Half way between two negative charges Half way between two positive charges In the area between two parallel plates. At the edges of two parallel plates 16. A capacitance of 0.033 µF is the same as which of the following? 330 pF 33 pF 3300 pF 33,000 pF 17. As capacitor plate area increases, all other things being equal, The capacitance decreases. The current-handling ability decreases. The capacitance does not change. The capacitance increases. 18. What prevents gravity from pulling you through the ground to the center of the Earth ? Electrons on the ground's surface of your feet repel one another Atoms are bound together by chemical bonds The density of the ground is greater than the density of your body The density matter is too great 19. One micro Farad is equal .................... Farad O.1 F 0.00001 F 0.0000001 F 0.001 F 20. 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? 0.1000 µF 0.1700 µF 0.1250 µF 0.0125 µF 21. 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? 3.7e3 N/C 8.2e2 N/C 2.0e-2 N/C 1.2e4 N/C 22. Electrons are... Unequal Negative Neutral Positive 23. If five 0.050-µF capacitors are connected in series, what is the net capacitance of thecombination? 0.010 µF 0.50 µF 0.25 µF 0.025 µF 24. The picture shows the symbol of Series Capacitor Fixed Capacitor Variable Capacitor Non Variable Capacitor 25. The capacitors stores energy in the form of Electric field Both magnetic and Electric field Non of the above Magnetic field 1 out of 25 Time is Up! Time's up