6 PHYS 272 - HW09 - FA22 Question 12 ole - /1 ... V1 - V2 = i V V2 - V3 = i V V3 - V4 = i V V1 - VA = i V What assumptions or approximations did you make in this calculation? O Assume the positive plate of the capacitor does not contribute to the electric field in the gap between the plastic and the negative plate O Assume the plastic slab did not polarize O Assume that the field due to the polarized plastic slab was negligible in the air gaps O Assume the radius of the plates was much larger than the distance between the plates O Assume the electric field inside the plastic slab is zero Save for Later Attempts: 0 of 10 used Submit AnswerQuestion 1 of 12 - /1 E .. . View Policies Current Attempt in Progress 3 mm, 6 volts 1III + ++++++++ A capacitor with a 3 mm gap has a potential difference of 6 volts (see the figure). A disk of glass 2.42 mm thick, with area the same as the area of the metal plates, has a dielectric constant of 2.7. It is inserted in the middle of the gap between the metal plates. Now what is the potential difference of the two metal disks? (It helps to make a diagram showing the electric field along a path.) i Save for Later Attempts: 0 of 10 used Submit AnswerQuestion 5 of 12 -/1 ... View Policies Current Attempt in Progress Calculate the potential at location A in the figure. Assume that q, = 9 nC, q2 = -3nC, a = 8 cm, b = 6 cm andc = 10 cm. (1 nC is 10-9C.) MO i V Save for Later Attempts: 0 of 10 used Submit AnswerQuestion 6 of 12 - /l E View Policies Current Attempt in Progress Two capacitors have the same size of plates and the same distance (3 mm) between the plates. The potentials of the two plates in capacitor #1 are -10 volts and 10 volts. The potentials of the two plates in capacitor #2 are 320 volts and 340 volts. (3) What is the electric eld inside capacitor #1? I V/m (b) What is the electric eld inside capacitor #2? I V/m Save for Later Attempts: 0 of 10 used Question 7 of 12 - /l 0 View Policies Current Attempt in Progress Suppose the potential at z = 3.08 m is 41 volts, and the potential at z = 333 m is -44 volts. What is the approximate value of EZ in this region? Include the appropriate Sign. I V/m Save for Later Attempts: O of 10 used Question 8 of 12 - /1 A highly charged piece of metal (with uniform potential throughout) tends to spark at places where the radius of curvature is small, or at places where there are sharp points. The breakdown electric eld strength for air is about 3 X 106 V/m. Part 1 (a) What is the maximum possible potential of a metal sphere of 2 cm radius in air? (That is, what is the potential at the surface of the sphere, relative to innity?) I V Save for Later Attempts: 0 of 10 used Submit Answer Part 2 (b) What is the maximum possible potential of a metal sphere of only 0.2 mm radius? I V Save for Later Attempts: 0 of 10 used