Homework Help: PHySICS

Posted by ChEm on Tuesday, April 13, 2010 at 10:52pm.

A rod 14.0 cm long is uniformly charged and has a total charge of -22.0 μC. Determine the magnitude
and direction of the electric field along the axis of the rod at a point 36.0 cm from its center.

ans:E = 1.59e6 N/C, pointing to the left
equation:k_e(Q/L)(1/a-(1/(L+a)))

I don't know what I should use for L and a, and I've tried every combination possible and I still can't get it.
Thank YOu!

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