A resistor of unknown resistance and a 15-? resistor are connected across a 20-V emf in such a way that a 2.0 A current is observed in the emf. What is the value of the unknown resistance?

A. 75 ?
B. 12 ?
C. 7.5 ?
D. 30 ?
E. 5.0 ?


Answer: D

Physics & Space Science

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