# Change in electromagnetic field

Suppose you have a configuration with two infinite rods parallel to the $$z$$ axis, each with uniform charge density $$\lambda$$. Suppose the rods move. In general, the electromagnetic field they generate satisfies Maxwell's equations. If the charge density on the rods doubles, what happens to $$E$$ and $$B$$ in general? I am inclined to think that $$E$$ doubles. Does $$B$$ double too?