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We consider a small element of length **dl** with a charge** dq** since the charge is uniformly distributed on the rod.

The electric field at point P due to charge element, dq is:

$\overline{)\stackrel{\mathbf{\rightharpoonup}}{\mathbf{E}}{\mathbf{=}}\frac{\mathbf{d}\mathbf{q}}{\mathbf{4}\mathbf{\pi}{\mathbf{\epsilon}}_{\mathbf{0}}{\mathbf{r}}^{\mathbf{3}}}\stackrel{\mathbf{\rightharpoonup}}{\mathbf{r}}}$

The charge element, dq is expressed as:

$\overline{){\mathbf{d}}{\mathbf{q}}{\mathbf{=}}\frac{\mathbf{Q}}{\mathbf{L}}{\mathbf{d}}{\mathbf{l}}}$

The figure (Figure 1) shows a thin rod of length L with total charge Q. Find an expression for the electric field E at distance X from the end of the rod. Give your answer in component form. Express your answer in terms of the variables Q, L, X, unit vectors i, j, and appropriate constants.

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Based on our data, we think this problem is relevant for Professor Perry's class at TEXAS.