Question

Which one of the following units is not that of mutual inductance?

• A. Henry
• B. Weber
• C. Ohm-second
• D. Volt-second- (ampere) ${}^{-1}$

Answer 1

Answer: (A)

Sl unit of mutual inductance is
$\frac{\text{ weber }}{\text{ amp }}=\frac{\text{ tesla }\times m^2}{\text{ amp }}=\frac{N\times m}{(\text{ amp }{)}^2}$
$=\frac{\text{ joule }}{{\text{ amp }}^2}=\frac{\text{ Coulomb }\times \text{ volt }}{{\text{ amp }}^2}$
$=\frac{\text{ volt }\times \text{ sec }}{\text{ amp }}=\text{ ohm }\times s$
But practical unit is henry $(H)$.