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Chapter 27: Q. 5 (page 761)

What is the difference between current and current density?

Short Answer

Expert verified

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

The density of current flow within the conductors is called current densityJ=IA.

Step by step solution

01

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.

02

Explanation (Part a)

Difference between current and current density:

The current flow is sustained by an established electric field.

I=qt

Here, Iis current in Ampere, qis charge in Coulomb, and tis time in seconds.

The current density written as follows.

J=IA

Here, Jis current density in A/m2,Iis current in Amperes, and Ais area of conductor in m2.

03

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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