21. A homogeneously charged infinite rod lies on the x-axis. If the rod has a linear charge density and P( 0 , r ) is t
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21. A homogeneously charged infinite rod lies on the x-axis. If the rod has a linear charge density and P( 0 , r ) is t
21. A homogeneously charged infinite rod lies on the x-axis. If the rod has a linear charge density and P( 0 , r ) is the electric field E at a point ?