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What is the inductance of a circuit with a 20-millihenry inductor connected in series with a 50-millihenry inductor?

  1. 30 millihenries

  2. 50 millihenries

  3. 70 millihenries

  4. 100 millihenries

The correct answer is: 70 millihenries

When inductors are connected in series, their inductances add together directly. This fact stems from the basic principle of series connections, where the total inductance is equal to the sum of the individual inductances. In this case, you have a 20-millihenry inductor and a 50-millihenry inductor. By adding these two values together: 20 millihenries + 50 millihenries = 70 millihenries. This resulting total of 70 millihenries represents the combined inductance of the circuit. Therefore, understanding the way inductors combine in series leads to recognizing that the correct answer is indeed 70 millihenries.