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The unit of induced emf is ______.

Asked in GSEB Board July 2021 · Applications and conceptual

(1) Tesla
(2) Volt/second
(3) Weber/second
(4) Henry

Answer: (3) Weber/second

Step-by-step solution

Idea: from Faraday's law, ε = -(dΦ_B)/(dt).

Flux is measured in weber and time in seconds, so emf has the unit weber/second.

Check: 1 Wb s⁻¹ = 1 T m² s⁻¹ = 1 V, the familiar unit of emf.

So the answer is weber/second.

Why the other options are wrong

(1) Tesla (Wb m⁻²) is the unit of magnetic field, not of emf.
(2) Volt/second is the unit of a rate of change of emf; the emf itself is measured in volts.
(4) Henry is the unit of inductance (Wb A⁻¹, or V s A⁻¹), not of emf.

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