The field strength at a point of finite distance from the infinitely long straight uniformly charged conductor is obtained by considering the radial (R) component and the longitudinal (L) component of the forces acting on a unit charge at the point, by the charges or, the elemental length of the conductor the resultant field strength is

• A. The sum of R-components, when the sum of L-components is zero
• B. The sum of L-components, when the sum of R-components is zero
• C. The sum of the both R- and L- components
• D. average of the sums of R- and L-components