Need help with 7,9,10 please The program linfit.nb yields the slope m delta m of
ID: 1330994 • Letter: N
Question
Need help with 7,9,10 please The program linfit.nb yields the slope m delta m of the plot ln( V) vs. t. Show how to compute tau and delta tau, given m and delta m. In part I of this lab, what is the stray capacitance and how is it measured? An RC circuit has a time constant of tau = 85 msec. A switch is closed, which causes the capacitor to discharge through the resistor. How long after the switch is closed will the voltage on the capacitor have fallen to 2% of its initial value? True or False: Holding everything else constant, if one capacitor is physically larger than another capacitor, then the larger-sized capacitor must have a larger capacitance.Explanation / Answer
9. V = V0 ( e^(-t / T)
V / V0 = e ^ (-t /T)
V/V0 = 2% = 0.02 Given.
T = 85 msec = 0.085 sec (Given)
Putting values,
0.02 = e^ ( - t / 0.085)
taking ln of both sides
ln(0.02) = ln e^ (-t / 0.085)
-3.91 = -t / 0.085
t = 0.3325 sec = 332.5 m sec ........Ans
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