Magnetic Effect of current|Biot Savart Law
Table of Content
Introduction
- In the previous chapter we have defined concept of magnetic field represented by vector B
- We defined magnetic field B in terms of force it exerts on moving charges and on current carrying conductors
- We also know that magnetic field is produced by the motion of the electric charges or electric current
- In this chapter we would study the magnetic field produced by the steady current
- we would study about how various factors affect the magnitude and direction of the magnetic field
- We will also learn to calculate the equation for magnetic field B if the current configuration is known using Biot-savart's law and ampere circuital law
Biot Savart Law
Comparison between Coulomb’s laws and Biot Savart laws
- Both the electric and magnetic field depends inversely on square of distance between the source and field point .Both of them are long range forces
- Charge element dq producing electric field is a scalar whereas the current element Idl is a vector quantity having direction same as that of flow of current
- According to coulomb’s law ,the magnitude of electric field at any point P depends only on the distance of the charge element from any point P .According to Biot savart law ,the direction of magnetic field is perpendicular to the current element as well as to the line joining the current element to the point P
- Both electric field and magnetic field are proportional to the source strength namely charge and current element respectively. This linearity makes it simple to find the field due to more complicated distribution of charge and current by superposing those due to elementary changes and current elements