Question
Now, disconnect everything from the coils. Connect a frequency generator to the primary coil using a single throw switch. Use an 11 Ohm for R_1. Remove the voltmeter and connect a 22 Ohm resistor across the secondary coil. The ferrous rod should be inserted in the coils. Then connect an oscilloscope to read points A and B connecting the oscilloscope grounds to the points indicated in Figure 4 by the symbol Set the frequency generator to produce a sine wave. Select a frequency of 100 Hz. Then, close the switch. Adjust the oscilloscope to display signals from both probes A and B. Move the traces of the two signals until they overlap. Record any observations that you make. Then, isolate each trace and record its peak-to-peak voltage readings. Record these values, and compute the ratio V_B/V_A. Adjust the frequency generator to several other frequencies, two lower (including one very low frequency), and three higher. Record your measurements.
Explanation / Answer
VB= secondary voltage, VA= primary voltage,
VB/VA= NB/ NA (where NB = no of turns in the secondary coil, NA = no of turns in the primary coil)
