Question

the frequency of the tuning fock whischs of bhsBil A) The observed resonance positions will baesva B) The observed resonance pesinions will have ala C) There is no change is the observed nesane oitn B) The resonance positions will oely change if the semprstan is the onur e changes 16. Figure below discharging cor.Choosing te "Exponential" fit option in Excel: ywymax) gives the ted: tram uns srIs shows voltage versus time for dcingpacto Figure: Voage versus time for B) When the the capacitor will discharge to 36.8 % ofis value. (5) a) 300s b)200s c)50s d) none of them aret A) What is the time costant of this RC-Cit (5) ) 180s ) 120s90s iv) 60s

Answer 1

y = y_0 exp(-mx) where m = 0.0111 & y_0 = 3 y = y_0 e^-mx equation (1) for discharging capacitor v_c = v_0 e^-t/tau equation (2) by comparing (1) & (2) 1/tau = m tau rightarrow time constant (A) implies tau = 1/m = 1/0.0111 = 90.09 s therefore time constant (tau) = 90 s (iii) (B) capacitor drops to 36.8 % in one time constant i.e. 90s (d) None of these.