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Q. 5

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Physics for Scientists and Engineers: A Strategic Approach with Modern Physics
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Short Answer

What is the difference between current and current density?

Charge moves through a wire at a rate known as current.

The density of current flow within the conductors is called current density

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Step by Step Solution

Step 1: Concept Introduction

A conductor's current is defined as the rate at which electric charges flow through it. Current density is defined as the volumetric flow of charge per unit area through a conductor.

Step 2: Explanation (Part a)

Difference between current and current density:

The current flow is sustained by an established electric field.

Here, is current in Ampere, is charge in Coulomb, and is time in seconds.

The current density written as follows.

Here, is current density in is current in Amperes, and is area of conductor in

Step 3: Final Answer

Hence, In conductors, the current density can be defined as the density of current flow within the conductors. A stable current means that its magnitude and direction will always remain the same.

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