The candidates were expected to connect the circuit as shown in Fig.1, measure and record in Table 1 current readings, plot the graph f(Hz) versus I(mA), determine the resonant frequency and the associated current from the graph.
The expected answers were:
Table 1
Frequency,
f (Hz) |
300 |
600 |
900 |
1200 |
1500 |
1800 |
2100 |
2400 |
2700 |
3000 |
Current,
I (mA) |
0.009 |
0.020 |
0.030 |
0.040 |
0.080 |
0.440 |
0.200 |
0.080 |
0.050 |
0.030 |
The candidates, as reported, understood the question and carried out the actions required. But unfortunately, some of the candidates did not record accurate readings, so their graph and deductions were wrong.