Your travels have taken you to another country. Since you have no money you decide to get a job and do some work. What is an occupation that really involves work in the scientific sense? Explain.

Find an expression for the electric field e⃗ at the center of the semicircle. hint: a small piece of arc length δs spans a small angle δθ=δs /r, where r is the radius. express your answer in terms of the variables q, l, unit vectors i^, j^, and appropriate constants.