Wed 9 a blackboard.und.edu Test: Chapter 28 Homework- PHYS 252: University Revie

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Wed 9 a blackboard.und.edu Test: Chapter 28 Homework- PHYS 252: University Review Test Submíssion: Chapter 28 v Question Completion Status: QUESTION 15 -1 points An uncharged capacitor and a resistor are connected in series to a source of emf of 10V, if C-20 find F and R-100 Q, a. the time constant of the circuit. 002 QUESTION 16 1 points b. What is the maximum charge on the capacitor? Enter your answer in uC. 200 QUESTION 17 1 points Save Answer c. The battery is disconnected and the capacitor discharges through the resistor. What is the volitage on the capacitor after one time constant? Click Save and Submit to save and submit. Click Save All Answers to save all answers.

Explanation / Answer

(a) Time constant is:

tau = RC = 100 * 20*10^-6 = 2 x 10-3 s = 0.002 s

(b) Qmax = CV = 20*10^-6 *10 = 2.00 x 10-4 C = 200 uC

(c) Use discharging eqn:

Vc = Vmax e-t/tau

Given, t = tau, So

Vc = Vmax e-1

= 10 * e-1

= 3.68V

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