HW4Problems

HW4Problems - m C charge. How much work would be required...

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HW4 : CHAPTER 24, QUESTIONS 14, 15 CHAPTER 21, PROBLEM 18 CHAPTER 22, PROBLEM 9 CHAPTER 23, PROBLEMS 23, 47 CHAPTER 24, PROBLEM 68 CHAPTER 25, PROBLEM 6 QUESTIONS : Q24-14) A dielectric is pulled from between the plates of a capacitor which remains connected to a battery. What changes occur to the capacitance, charge on the plates, potential difference, energy stored, and electric field? Q24-15) How does the energy stored in a capacitor change when a dielectric is inserted if (a) the capacitor is isolated so Q doesn’t change; (b) the capacitor remains connected to a battery so V doesn’t change? PROBLEMS : P21-18) Two point charges have a total charge of 560 m C. When placed 1.10 m apart, the force each exerts on the other is 22.8N and is repulsive. What is the charge on each? P22-9) The field just outside a 3.50 cm radius metal ball is 2.75 x 10 2 N/C and points towards the ball. What charge resides on the ball? 23-23) A +25 m C charge is placed 6.0 cm from an identical +25
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Unformatted text preview: m C charge. How much work would be required by an external force to move a +0.10 m C test charge from a point midway between them to a point 1.0 cm closer to either of the charges? P23-47) In a certain region of space, the electric potential is given by V = y 2 +2xy-4xyz. Determine the electric field vector E in this region. P24-68) A homemade capacitor is assembled by placing two 9 inch pie pans 10cm apart and connecting them to the opposite terminals of a 9V battery. Estimate (a) the capacitance, (b) the charge on each plate, (c) The electric field halfway between the plates, (d) the work done by the battery to charge the plates. (e) Which of the above values change if a dielectric is inserted? P25-6) An electric device draws 5.50A at 110V. (a) If the voltage drops by 10%, what will be the current, assuming nothing else changes? (b) If the resistance of the device were reduced by 10%, what current would be drawn at 110V?...
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