PHYS208 Fundamentals of Physics II

Hint for Ch. 25, 3Q

Keep in mind that potential is a scalar, so there is no cancellation via oppositely directed vectors as with E.

Hint for Ch. 25, 4Q

Opposite charges at the same distance away from point of consideration cancel each others contribution.

Hint for Ch. 25, 3P

(a) change in potential energy = (charge) x (potential difference)
(b) change in potential energy = change in kinetic energy
(c) heat required for melting = (mass) x (latent heat)
Sorry that (c) was not covered in PHYS207 -- probably in CHEM class though...


"http://www.physics.udel.edu/~watson/phys208/exercises/hints/0216.html"
Last updated Feb. 17, 1998.
Copyright George Watson, Univ. of Delaware, 1997.