Question

The unit $1N{m}^{-1}$ is equivalent to

• A. 1 erg $c{m}^{-1}$
• B. 1 erg $c{m}^{-2}$
• C. $1J{m}^{-1}$
• D. $1J{m}^{-2}$

Answer 1

Answer: (D)

$N{m}^{-1}=\frac{N}{m}=\frac{Nm}{m^2}=\frac{\text{ joule }}{m^2}$
$\therefore$ Equivalent unit is $J{m}^{-2}$