Question

all number 8 please

strength of the electric field between points A and B? (p. 461) tential lines are separated by a distance of 1 cm, what is the approximate (p. 477) 8. a) Write the capacitance of two parallel plates with area, A, separated by a distance, d, and filled with dielectric constant, K. b) What happens to the capacitance if one doubles the area of the plates? c) W hat happens to the capacitance if one doubles the distance separating the plates? d) What happens to the capacitance if one replaces the air between the plates with glass (K 5) e) Start with potential energy stored by a capacitor given by U QV and use Q -CV to eliminate Q and write U in terms of C and V ) Start with potential energy stored by the capacitor given by U %QV and use Q CV to eliminate V and write U in terms of C and Q g) Suppose a capacitor is connected to a battery supplying V volts and (while connected) the air between the plates is replaced by glass (K 5) We wish to determine the change in stored energy due to slipping in the glass. By keeping the capacitor connected to the battery, which is held constant, V or Q? To determine what happens to potential energy, then, which of the above expressions should be used? (We only want capacitance to be allowed to change) O1 Ct 2 C Putting glass in this capacitor connected to a battery will cause the potential energy to increase/decrease (circle one) by a factor of five. h) Suppose a capacitor is fully charged to +Q and -Q Coulombs of charge on each side and then removed from the battery the air between the plates is then replaced by glass (K- 5). We wish to determine the change in stored energy due to slipping in the glass. Having disconnected the capacitor from the battery, which is held constant, V or Q? To determine what happens to potential energy, then, which of the above expressions should be used? (We only want capacitance to be allowed to change) 2 C Putting glass in this capacitor disconnected from the battery will cause the potential energy to increasc/decrease (circle one) by a factor of five. ERGO, the glass will be "sucked" into the capacitor!!

Answer 1

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