+1.00 nC of charge is uniformly distributed along the left half of a thin rod of total length L = 4.00 m, while -1.00 nC of charge is uniformly distributed along the right half of the rod, as shown in the figure. What is the magnitude of the electric field E at the dot, a distance r= 1.55 m from the centre of the rod? Magnitude: 7 +++ ++ d