MATH 110 Midterm: Exam 4A No Solutions Fall 1997
14 Mar 2019
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No calculators or books are needed or permitted. However, a formula sheet (two pages of us letter size paper). Problems are on both sides of this page. Even if you don"t know how to solve the problem, state in words what you think is happening and why. Express all answers in terms of the variables de ned in the problem: [25 points] (a) [15 points] a ring of radius r lies in x y plane, with its center at the origin. The ring contains charge q, uniformly distributed around the ring. What is the orientation and magnitude of the electric eld at a distance z along the z axis? (b) [10 points] two identical rings of radius r are in x z and y z planes, respectively. The center of the ring in x z plane is at (r, 0, 0) and contains charge +q.
