## PHYS208 Fundamentals of Physics II

### Hint for Ch. 28, 69P

Differentiate the expression for the charge of a charging capacitor with respect to time
to find the rate of change of charge. Evaluate at the time of interest.

For the rate of energy stored by the charging capacitor, differentiate the energy expression
*Q*^{2} / 2C and use the above result.

Note that the rate of change of charge on the capacitor *is* the current in the circuit
to be used for evaluation of the power dissipated by the resistor and the power delivered
by the emf.

"http://www.physics.udel.edu/~watson/phys208/exercises/hints/28-69P.html"

Last updated March 12, 1998.

Copyright George Watson, Univ. of Delaware, 1998.