question 9 of 10\nassuming that voltage remains constant, what happens to the current in a wire if the…

question 9 of 10\nassuming that voltage remains constant, what happens to the current in a wire if the length of the wire increases?\na. the current decreases.\nb. the current increases.\nc. the current alternates between high and low values.\nd. the current is not affected by a change in wire length.

question 9 of 10\nassuming that voltage remains constant, what happens to the current in a wire if the length of the wire increases?\na. the current decreases.\nb. the current increases.\nc. the current alternates between high and low values.\nd. the current is not affected by a change in wire length.

Answer

Brief Explanations:

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

Answer:

A. The current decreases.