HW02(1) - Physics 201 Homework Set 02 CHAPTER 23 Electrical...

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Physics 201 Homework Set 02 CHAPTER 23: Electrical Potential 23[9, 18, 29, 31, 44] CHAPTER 24: Capacitors 24[5, 7, 17, 29, 31, 37, 43, 71] 1 23–2 Potential Related to Electric Field 9. (I) What minimum radius must a large conducting sphere of an electrostatic generating machine have if it is to be at 35,000 V without discharge into the air? How much charge will it carry? 18. (II) Estimate the electric field in the membrane wall of a living cell. Assume the wall is 10nm thick and has a potential of 0.10 V across it. 23–3 Potential Due to Point Charges 27. (II) A +25 µ C point charge is placed 6.0 cm from an identical +25 µ C point charge. How much work would be required by an external force to move a +18 µ C test charge from a point midway between them to a point 1.0 cm closer to either of the charges? 31. (II) An electron starts from rest 42.5 cm from a fixed point charge with Q= -0.125nC. How fast will the electron be moving when it is very far away? 23–5 Equipotentials 44. (II) A metal sphere of radius 0 0.44 m r = carries a charge Q= 0.50 µ C. Equipotential surfaces are to be drawn for 100-V intervals outside the sphere. Determine the radius
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