[单选题]
An atomic nucleus has a charge of +40e. What is the magnitude of tiihumw7*d. 0nhe elec5;4pbh.( 7nvz vscdpe7 ;dvs ytric field at a distance of 1.0 m from the nucd n;;s4p 7vesdcz v(h57.b vpyleus?
A. $5.6 \times 10^{-8} \; N/C$
B. $5.8 \times 10^{-8} \; N/C$
C. $6.0 \times 10^{-8} \; N/C$
D. $6.2 \times 10^{-8} \; N/C$
