Question: The current through the 20- resistor in Fig. 19-68 does not change whether the two switches S1 and S2 are both open or both closed.

The current through the 20-Ω resistor in Fig. 19-68 does not change whether the two switches S1 and S2 are both open or both closed. Use this clue to determine the value of the unknown resistance R.

20 S, 50 6.0 V

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