RRB Technician Grade 1 Model Paper 2

Concept:Self-inductance is the property of a coil that opposes any change in current through it. Its unit is derived from the magnetic flux linked per unit current.Explanation:Magnetic flux linked with a coil is given by $\phi = LI$, where $L$ is self-inductance and $I$ is the current. Rearranging gives $L = \frac{\phi}{I}$. The SI unit of magnetic flux $\phi$ is weber (Wb). The SI unit of current $I$ is ampere (A). Therefore, the unit of self-inductance is $\frac{\text{Wb}}{\text{A}}$, which is also called henry (H).Answer:Option D – Wb/A.