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 $(H)$.