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The figure(Figure 1) shows a thin rod of length L with total charge Q.

Find an expression for the electric field strength on the rod at distance R from the center.

- Express your answer in terms of the variables L, Q, R, and appropriate constants.
- Express your answer in two significant figures and indicate the appropriate units.

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♦ Relevant knowledge

The electric field resulting from an array of charges can be determined using the superposition theory: the entire electric field includes the all electric fields for each charge within the system. In the event of constant charge distributions, that summation is been replaced by integration:

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The expression for the electric field strength on the rod at distance R from the center is: