1975B2. Two identical electric charges +Q are located at two corners A and B of an isosceles triangle as shown above.
a. How much work does the electric field do on a small test charge +q as the charge moves from point C to infinity,
b. In terms of the given quantities, determine where a third charge +2 Q should be placed so that the electric field at point C is zero. Indicate the location of this charge on the diagram above.