A positive point charge +Q is fixed at the origin. Three points lie on the positive x–axis at distances 0.50 m (point P), 1.0 m (point Q), and 1.5 m (point R) from the charge. Rank the magnitudes of the electric field at these points from greatest to least.
a) R>Q>P
b) Q>P>R
c) P>Q>R
d) P=Q=R