The candidates were expected to connect the circuit as shown in Figure 2, measure and record in Table 2 the expected readings. They were also required to plot the graph V(V) versus f(Hz), determine the frequency at which the voltage is minimum and comment on the voltage at resonance.
The expected answers were:
Table 2
Frequency, f (Hz) |
300 |
600 |
900 |
1200 |
1500 |
1800 |
2100 |
2400 |
2700 |
3000 |
Voltage,
V (V) |
17.0 |
8.0 |
3.0 |
1.6 |
1.0 |
0.7 |
0.6 |
0.4 |
0.3 |
0.2 |
The candidates, understood the question and carried out the actions required. Many of the candidates did not get accurate readings, so their graph and deductions were wrong.