A very long, thin wire has a uniform linear charge density of 50 μC/m. What is the electric field at a distance 2.0 cm from the wire?
a) 9.0 x 10³ N/C
b) 2.5 x 10³ N/C
c) 1.2 x 10⁴ N/C
d) 5.0 x 10³ N/C