One hundred meters of a certain type of wire has a resistance of 7.2 $\Omega$.What is the resistance of 2.5 m of this wire?
A) 18 $\Omega$
B) 1.8 $\Omega$
C) 0.18 $\Omega$
D) 3.0 $\Omega$
E) 0.30 $\Omega$

Question

Quizplus · Accepted Answer

The resistance is directly proportional to the length of the wire. Therefore, the resistance of 2.5 m is $(2.5/100) \times 7.2 \, \varOmega = 0.18 \, \varOmega$.

One Hundred Meters of a Certain Type of Wire Has Ω\OmegaΩ

One Hundred Meters of a Certain Type of Wire Has $\Omega$