MasterinqPh.sics Problems trom Chapter 21 Google Chrome 0 i Secure https:f /n ye
ID: 1784881 • Letter: M
Question
MasterinqPh.sics Problems trom Chapter 21 Google Chrome 0 i Secure https:f /n yet/item View?assignment ProhlemID=86560936&offset;=next Resources « previous 15 ot 20 next Problem 21.50 Part A It takes 2 52 far the crrert in an LR circuit to rwrease fromm zero ti 088 ts maumum value. Determine the timet constant or the circuit Express your answer to two significant figures and inelude the appropriate units. Value Units Submit My Answers Give up Part B Derermine the resistance ot the circuit it 30.0 mll Express your answer to two significant figures and include the appropriate units. RValue Units Submit Continue 11:01 PM Search the web and Windows ^41 CNG 10/22/201/Explanation / Answer
current equation is
i = imax (1-exp(--t/T)
0.66 = 1-exp(-t/T)
exp(-t/T) = 0.34
exp(t/T) = 2.94
t/T = ln(2.94) = 1.08
T = 2.52/1.08 = 2.33 ms
T = L/R
R = 30*10^-3/2.33*10^-3 = 12.88 ohm