Physics 212 Exam I Sample Question Bank 2008 Multiple Choice ...

Physics 212 Exam I Sample Question Bank 2008Q 1qQ 2Three charges are placed as shown at right,Q 1 = −64 µC at (0,3m),Q 2 = 125 µC at (0,0), andQ 3 = 27 µC at (4m,0),(A) Determine the x and y components of theelectric field at the location (4m,3m).(B) Determine the x and y components of electricforce on a charge q = 30 µC placed at the point(4m,3m).Q 13m4mQ2Q 3Three source charges are placed at thecorners of an equilateral triangle 2m on aside, as shown. Q 1 and Q 2 are located onthe base corners, and have a charge of+10µC each. Q 2 is located at top cornerand has a charge of -10µC. a) Calculatethe Electric Field (x and y components)at the point at the center of the triangle.b) Calculate the electric potential at thepoint at the center of the triangle.Q3A test charge of 30 µC is placed at thepoint at the center of the triangle.c) What is the force on this charge?d) What is its (electrostatic) potentialenergy?Q1Q2An electron gun accelerates electrons across a potential difference of 30.0 kV. The beam is fired horizontallybetween to charged conducting plates in order to deflect the beam vertically. The deflecting plates are 2.00 cm