## PHYS208 Fundamentals of Physics II

### Answer for Ch. 30, 47P

a)

b)

c)

d) zero

e)
When *r* = *c*, the formula for a) should give the same result as the formula for b).

When *r* = *b*, the formula for b) should give the same result as the formula for c).

When *r* = *a*, the formula for c) should give zero.

"http://www.physics.udel.edu/~watson/phys208/exercises/answers/30-47P.html"

Last updated April 2, 1998.

Copyright George Watson, Univ. of Delaware, 1997.