A. determine the sign of the charge on each rod.
b. compute the ratio of the linear charge densities on the two rods, .

Answer.

The electric field due to a negative charge points radially in from all directions (because a positive test charge placed near it would feel a force pointing toward it). Generally, electric field lines always point from positive charges and toward negative charges.

Your question I s incomplete, please endeavor you update your question with the necessary parameters.

where's the diagram?

d.) circle motion requires a force to give it a centripetal acceleration.