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Unformatted text preview: 3. A spherical cloud of interstellar dust has a radius 4.00x10 10 m and an approximately uniform charge density of 3.00x10-9 C m 3 . Find the electric field at a distance of 2.00x10 10 m from the center of the cloud. Physics 4B FIRST EXAM Chapters 23 - 25 Spring 1995 3 4. Find the potential due to a ring of total charge Q and radius R at the point P a distance x from the center of the ring along the axis as shown at the right. 5. An electron is accelerated from rest with a set of parallel plates as shown at the right. The plate at the far right has a hole so that the electron can escape. Find the potential difference required on the plates if the electron leaves the accelerator with a speed of 1.00x10 6 m/s. Indicate in the drawing which plate is positive. Q R x x P e e v...
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- Fall '09