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Find the direction (theta, measured from the x-axis) of the electric field at point P due to a uniformly charged finite rod, in the standard configuration where P lies symmetrically such that the rod subtends equal angles of 45 degrees on each side of the perpendicular from P.

1. 45 deg from x-axis
2. 30 deg from x-axis
3. 60 deg from x-axis
4. none of these

Correct answer: 45 deg from x-axis

Solution

Using the standard finite-rod field components, for the symmetric configuration described the parallel and perpendicular components are equal, so the resultant field makes 45 degrees with the x-axis.

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