When a 20-V emf is placed across two resistors in series,a current of 2.0 A is present in each of the resistors.When the same emf is placed across the same two resistors in parallel,the current through the emf is 10 A.What is the magnitude of the greater of the two resistances?
A)7.2 $\Omega$
B)7.6 $\Omega$
C)6.9 $\Omega$
D)8.0 $\Omega$
E)2.8 $\Omega$

Question

When a 20-V emf is placed across two resistors in series,a current of 2.0 A is present in each of the resistors.When the same emf is placed across the same two resistors in parallel,the current through the emf is 10 A.What is the magnitude of the greater of the two resistances?
A)7.2  $\Omega$ 
B)7.6  $\Omega$ 
C)6.9  $\Omega$ 
D)8.0  $\Omega$ 
E)2.8  $\Omega$

Quizplus · Accepted Answer

The greater of the two resistances is the one that has the higher resistance value. In this case, the resistance of the resistor that is in series with the emf is greater than the resistance of the resistor that is in parallel with the emf. Therefore, the correct answer is A.

When a 20-V Emf Is Placed Across Two Resistors in Series,a