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Which physical quantity in an electrical system is equivalent to mass (m) in a mechanical system?

Asked in GSEB Board July 2023 · Frequency and current in LC

• (1) Inductance (L)
• (2) Capacitance (C)
• (3) Reciprocal of inductance (1/L)
• (4) Reciprocal of capacitance (1/C)

Step-by-step solution

Why the other options are wrong

• (2) Capacitance plays the part of 1/k, the reciprocal of the spring constant, since the stored energy (q²)/(2C) matches 1/2kx². It is not the analogue of mass.
• (3) Inverted. L itself multiplies (d²q)/(dt²), exactly as m multiplies (d²x)/(dt²).
• (4) 1/C is the analogue of the spring constant k: compare (q²)/(2C) with 1/2kx².

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