A Resistor of Unknown Resistance and a 15- $\Omega$ Resistor Are Connected Across a 20-V Emf in Such a Are

question 88

Multiple Choice

A resistor of unknown resistance and a 15- $\Omega$ 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 \(\Omega\)
• B)12 \(\Omega\)
• C)7.5 \(\Omega\)
• D)30 \(\Omega\)
• E)5.0 \(\Omega\)

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