Two long, charged, thin-walled, concentric cylindrical shells have radii of 2.9 and 4.4 cm. The charge per unit length is 7.0×10−6 C/m on the inner shell and −9.8×10−6 C/m on the outer shell. What are the (a) magnitude E and (b) direction (radially inward or outward) of the electric field at radial distance r = 3.5 cm? What are (c) E and (d) the direction at r = 8.1 cm? (a) Number Units (b) (c) Number Units (d)