Determine the magnitude of the electric field at the point P. Express your answer in terms of QQQ, xxx, aaa, and kkk. Express your answer in terms of the variables QQQ, xxx, aaa, kkk, and appropriate constants.

spectral lines lyman is one set

see the picture for the vector

the magnitude of the vector by pythagorean theorem

r = √( (-10)^2 + (3)^2 ) = √109

magnitude = √109 units

the direction angle between vector and x-axis is

tan^(-1)(3/10) = 16.699

so the direction is approximately 16.7 degrees north of west