Question

question 9 of 10
assuming that voltage remains constant, what happens to the current in a wire if the length of the wire increases?
a. the current decreases.
b. the current increases.
c. the current alternates between high and low values.
d. the current is not affected by a change in wire length.

Explanation:

According to Ohm's law $V = IR$ (where $V$ is voltage, $I$ is current, and $R$ is resistance), and the resistance formula $R=
ho\frac{l}{A}$ ($
ho$ is resistivity, $l$ is length, $A$ is cross - sectional area). When voltage $V$ is constant, if length $l$ increases, resistance $R$ increases (assuming $
ho$ and $A$ are constant). Since $I=\frac{V}{R}$, an increase in $R$ leads to a decrease in $I$.

Answer:

A. The current decreases.