
Concept explainers
Refer to the two magnetically coupled coils of Fig. 13.69(a). The polarity of the mutual voltage is:
- (a) Positive
- (b) Negative
Figure 13.69

Choose the correct option, which is the polarity of the mutual voltage.
Answer to Problem 1RQ
The correct option from the given choices is
Explanation of Solution
Given data:
Refer to Figure 13.69(a) in the textbook for the two magnetically coupled coils.
Calculation:
Modify the Figure 13.69(a) by indicating positive and negative terminals and mentioning coils 1 and 2. The modified figure as shown in Figure 1.
Consider that the currents are denoted as
In Figure 13.69(a), the current
Similarly, the current leaves at the dotted terminal of coil 2 and the voltage is positive in the dotted terminal of coil 1. Hence, the mutual voltage
Therefore, the polarity of mutual voltage is negative. Hence, the option (b) is correct and option (a) is incorrect.
Conclusion:
Thus, the correct option from the given choices is
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