The charge per unit length on a long, straight filament is -87.0 µC/m.

(a) Find the electric field 10.0 cm from the filament. Distances are measured perpendicular to the length of the filament. (Take radially inward toward the filament as the positive direction.)
MN/C

(b) Find the electric field 26.0 cm from the filament.
MN/C

(c) Find the electric field 140 cm from the filament.
MN/C