7.3×103 N/M7.3\times 10^3\mathrm{~N}/\mathrm{M}7.3×103 N/M
72×104 N/M72\times 10^4\mathrm{~N}/\mathrm{M}72×104 N/M
73×104 N/M73\times 10^4\mathrm{~N}/\mathrm{M}73×104 N/M
7.2×104 N/M7.2\times 10^4\mathrm{~N}/\mathrm{M}7.2×104 N/M
No correct answer\text{No correct answer}No correct answer