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Which one of the following is not a measurable quantity?

Asked in JEE Main 28th Jan 2nd Shift 2026 · Displacement current equals conduction current

Answer: (3) Voltage

Step-by-step solution

Every meter reads a difference: a voltmeter measures the potential difference between two points, never an absolute potential

Absolute voltage (potential) is fixed only after an arbitrary zero is chosen, so it is not itself measurable

Displacement current is measurable — it is detected through the magnetic field it produces between the plates — and resistance is measured as the V–I ratio

Why the other options are wrong

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