Introduction To Health Physics
Introduction To Health Physics
5th Edition
ISBN: 9780071835275
Author: Johnson, Thomas E. (thomas Edward), Cember, Herman.
Publisher: Mcgraw-hill Education,
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Chapter 2, Problem 2.5P

A small electrically charged sphere of mass 0.1 g hangs by a thread 100-cm long between two parallel vertical plates spaced 6-cm apart. If 100 V are across the plates and if the charge on the sphere is 10 9 C, what angle does the thread make with the vertical direction?

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A small ball of mass m=8.10×10−12 kg has acquired an excess charge. The ball is then placed between two parallel plates spaced x=0.00345 m apart, which have a potential difference of V=2110 V applied across them. In this configuration, the ball appears to be motionless, or floating in between the plates.   What is the overall charge on the ball? negative? positive? or neutral?   Calculate the number of electrons, ne, that the ball has either gained or lost. The acceleration due to gravity is g=9.81 m/s2, and the elementary unit of charge is e=1.60×10−19 C. ne=?
Flying insects such as bees may accumulate a small positive electric charge as they fly. In one experiment, the mean electric charge of 50 bees was measured to be ++(30 ±± 5) pCpC per bee. Researchers also observed the electrical properties of a plant consisting of a flower atop a long stem. The charge on the stem was measured as a positively charged bee approached, landed, and flew away. Plants are normally electrically neutral, so the measured net electric charge on the stem was zero when the bee was very far away. As the bee approached the flower, a small net positive charge was detected in the stem, even before the bee landed. Once the bee landed, the whole plant became positively charged, and this positive charge remained on the plant after the bee flew away. By creating artificial flowers with various charge values, experimenters found that bees can distinguish between charged and uncharged flowers and may use the positive electric charge left by a previous bee as a cue…
Six conducting spheres all with the same radius are brought into contact. Before contact, they have charges of 7.7 mC, -1.3 C, 8 C, 6.2 mC, 7.3 mC and 3.9 mC respectively. What is the charge on each sphere after contact?

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