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Application of Gauss's theorem: electric field due to infinitely long straight conductor
Ans :Gauss"s law relates the electric charge distribution and the corresponding electric field intensity.
Consider  an infinite long straight conductor having uniform linear charge density (?) and a point P located at a perpendicular distance r from the linear charge distribution. 
The electric field intensity ( E ) at point P on an infinitely long straight charged line is equal to 
                  
where ,
? = linear charge density
?0 = electrical permittivity of free space
r = radius
? = unit vector in the direction of radius.


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