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If C and R denote capacitance and resistance, the dimensional formula of CR is

1. [M⁰ L⁰ T¹]
2. [M⁰ L⁰ T⁰]
3. [M⁰ L T⁻¹]
4. not expressible in terms of M,L,T

Correct answer: [M⁰ L⁰ T¹]

Solution

The dimensional formula of capacitance (C) is [M⁻¹ L⁻² T⁴ A²], and resistance (R) is [M L² T⁻³ A⁻²]. Multiplying these gives [M⁰ L⁰ T¹], which represents time.

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