The electric field across a cell membrane is 1.0 ×10^7 N / C directed into the cell. (a) If a po

step 1 Solving party of this problem. So here I can write, since positive charge moves, positive charge

The electric field across a cell membrane is 1.0 ×10^7 N / C...

The electric field across a cell membrane is $1.0 \times$ $10^{7} \mathrm{N} / \mathrm{C}$ directed into the cell. (a) If a pore opens, which way do sodium ions $\left(\mathrm{Na}^{+}\right)$ flow $-$ into the cell or out of the cell? (b) What is the magnitude of the electric force on the sodium ion? The charge on the sodium ion is +e.

The electric field across a cell membrane is $1.0 \times$ $10^{7} \mathrm{N} / \mathrm{C}$ directed into the cell. (a) If a pore opens, which way do sodium ions $\left(\mathrm{Na}^{+}\right)$ flow $-$ into the cell or out of the cell?
(b) What is the magnitude of the electric force on the sodium ion? The charge on the sodium ion is +e.

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Key Concepts

Electric Field

An electric field is a region of space where a charged particle experiences a force per unit charge. It is a vector quantity, meaning it has both magnitude and direction. In general, the field direction is taken as the direction that a positive charge would be pushed, which is critical to determining the movement of ions in various contexts, including across cell membranes.

Electric Force

The electric force on a charged particle in an electric field is given by the equation F = qE, where q is the charge and E is the electric field strength. This force determines the acceleration and motion of the particle and is essential in understanding how ions, such as Na+, behave when exposed to electric fields.

Charged Particle Motion in Electric Fields

Charged particle motion in an electric field depends on the sign of the charge. Positive charges move in the direction of the electric field, while negative charges move in the opposite direction. This concept is crucial, particularly when analyzing the movement of ions across cell membranes under the influence of an electric field.

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