Question

30,32

b) What if both charges are PUSILIVU. 26. Two point charges 91 and 92 are 3.00 m apart, and their total charge is 20 °C. (a) If the force of repulsion between them is 0.075 what are magnitudes of the two charges? (b) If one charge attracts the other with a force of 0.525N, what are the magnitudes of the two charges? Note that you may need to solve a quadratic equation to read your answer. 18.4 Electric Field: Concept of a Field Revisited 27. What is the magnitude and direction of an electric field that exerts a 2.00x10" N upward force on a -1.75 uC charge? 28. What is the magnitude and direction of the force exerted on a 3.50 uC charge by a 250 N/C electric field that points due east? 29. Calculate the magnitude of the electric field 2.00 m from a point charge of 5.00 mC (such as found on the terminal of a Van de Graaff). 30. (a) What magnitude point charge creates a 10,000 N/C electric field at a distance of 0.250 m? (b) How large is the field at 10.0 m? 31. Calculate the initial (from rest) acceleration of a proton in a 5.00x 10° N/C electric field (such as created by a research Van de Graaff). Explicitly show how you follow the steps in the Problem-solving Strategy for electrostatics. 32. (a) Find the direction and magnitude of an electric field that exerts a 4.80x10-17 N westward force on an electron. (b) What magnitude and direction force does this field exert on a proton? 18.5 Electric Field Lines: Multiple Charges 33. (a) Sketch the electric field lines near a point charge +9. (b) Do the same for a point charge -3.00q.

Answer 1

So)"30(a) magnitude of the electoic field at a distance r= 0.250m Er= imo= 10^ NIC

on 9 = 40€.rx 104 - (0.950) x 109 9x109 of q = 69.44x 10-90 So, magnitude of point change is q = 69.44x100c Electric field at r= 10m is q 69.44 x 10-9x9x109 -N/C E = 41 6082- 10) (b) E = 6.95 N/

2 501" 32 = lenye magnitude and direction of an electric field that exerts a force on election is Now, dectric field is F = 4.80% 10 'N Westward Ē = 4.80x 10-17 Nic eastward = 3x10 Neend 1.68 10-19 E = 3x10²Nic eastward magnitude and direction of the force acting on the proton is b magnitude Feet = 4.80% 10'7N), eastward
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