\"Measuring t-half The voltage across a resistor (R) in an RC circuit is display

Question

"Measuring t-half The voltage across a resistor (R) in an RC circuit is displayed on an oscilloscope as shown in the first graph below - Voltage (y- axis) vs time (x-axis). The voltage is proportional to the current in the RC circuit. The trace shows the current falling from its maximum value to zero after some time. In the second graph, the sweep time settings have been adjusted (reduced by a factor of 10) and only the first part of the trace is displayed, so the time constant can be determined accurately. The sweep time (x-axis) settings are: 2 HS/Div What is the value of t1/2 for this circuit? (Give your answer in us to the nearest whole number. It is not necessary to specify units.) Answer

Explanation / Answer

from the second graph:

time scale 2 us/div

consider the verticle mid as 0.

the height is 4 div

from 4 div , it falls to 2 div in 3.5 horizontal div

time = 3.5 *2 = 7 us

t1/2 = 7 us. (micro s.)

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