Experimental part. 1. Measure the amplitudes of electric oscillations as it is shown in figure 20.4

1. Measure the amplitudes of electric oscillations as it is shown in figure 20.4. Put down the values of measurements in table 20.1.

Figure 20.4

2. Put down the metal plate on the inductance. Measure the amplitudes of electric oscillation. Put down the date of measurement in table 20.1.

3. Plot the graph, plotting ln U_m against a time t for two cases:

a) air-core inductance;

b) inductance with a metal plate.

Table 20.1

.

4. Calculate the damping factor and logarithmic decrements for two cases if T = 0.5 ms.

5. Make analysis of the experimental results.