A piezoelectric transducer has a capacitance of 1500 pF and leakage resistance of 105 MΩ. The oscilloscope used for read-out has a resistance of 1 MΩ in parallel with a capacitance of 500 pF. What is the time constant of the entire system ?
1
0.002 s
2
0.20 s
3
20 s
4
200 s