ch27-p064

# ch27-p064 - 2 64(a The initial energy stored in a capacitor...

This preview shows page 1. Sign up to view the full content.

() ( ) 2 36 2 22 1 . 0 s 2 . 0 0 2 2 1.0 10 C 1.0 10 1.0W , 1.0s tt t qR Pe e e τ −− ×× == = where t is again measured in seconds. 64. (a) The initial energy stored in a capacitor is given by 2 0 /2 , C UqC = where C is the capacitance and q 0 is the initial charge on one plate. Thus qC U C 0 63 1 0 1 0 0 5 0 1 0 1 0 × = × .. . FJ C . ch b g (b) The charge as a function of time is given by qq e t = 0 , where is the capacitive time constant. The current is the derivative of the charge i dq dt q e t =− = 0 , and the initial current is i 0 = q 0 / . The time constant is RC ( )( ) 66 1.0 10 F 1.0 10 = . Thus i 0 33 10 10 10 = × . Cs A c h bg . (c) We substitute 0 t e = into V C = q / C to obtain 3 1.0 s 3 1.0 0 6 1.0 10 C 1.0 10 V
This is the end of the preview. Sign up to access the rest of the document.

## This note was uploaded on 06/03/2011 for the course PHY 2049 taught by Professor Any during the Spring '08 term at University of Florida.

Ask a homework question - tutors are online