PHY 142 Midterm: PHYS 142 University of Rochester P142 2010 Exam 1
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Please read the problems carefully and answer them in the space provided. Write on the back of the page, if necessary. Charge q experiences a repulsive force of 0. 50 mn when placed at a distance of 25 cm from charge q1, and it experiences an attractive force of 0. 25 mn when placed a distance of 75 cm from charge q2. The magnitude of the ratio q1/q2 is: 2/9, 2/3, 9/2, 6, 3/2, 18. Consider the arrangement of charges shown in the sketch. Determine the electric field at the position of charge iii. The net electrical flux through a spherical gaussian surface of radius 1. 0 cm is 24 nm2/c. If the radius of the surface is doubled to 2. 0 cm, the electric flux will become: 96 nm2/c, 24 nm2/c, 12 nm2/c, 6 nm2/c, 3 nm2/c. In each situation, two charged plates with the voltages shown are separated by a specified distance.