The unit of inductance is

Analyze the question: The question asks for the SI unit of inductance, a property of coils and circuits that opposes changes in current.

Concept: Inductance (L) relates the induced e.m.f. to the rate of change of current:

E = −L (dI/dt)

So L = E / (dI/dt), and its unit is volt-second per ampere (V·s/A).

The unit with this definition is named the Henry (H), after Joseph Henry.

Checking each option:

• A. Weber (Wb): the unit of magnetic flux. ✗
• B. Tesla (T): the unit of magnetic flux density (Wb/m²). ✗
• C. Hertz (Hz): the unit of frequency (cycles per second). ✗
• D. Henry (H): the unit of inductance. ✓
• E. Farad (F): the unit of capacitance. ✗

Answer: The correct option is D, Henry.

Tip: Link each unit to its quantity:

• Henry → H-inductance (L)
• Farad → F-capacitance (C)
• Weber → flux
• Tesla → flux density
• Hertz → frequency

A simple memory aid: "Henry Holds back current," because an inductor opposes changes in current.