What is equivalent to the unit of electric field strength? A JCm-1 B NsA-1 C kgmsA-1 D kgm'sA-1

Choice C is correct because the SI unit for electric field strength is N/C or kgms⁻²C⁻¹, which can be further expressed as kgms⁻³A⁻¹. Choice A is incorrect because: JCm^{-1} can be expressed as (kg m² s⁻²) / (A s m⁻¹) in SI units. Simplifying this gives kg m³ s⁻³ A⁻¹, which is not the SI unit for electric field strength. Choice B is incorrect because: Newton-seconds per Ampere can be expressed as (kg m s⁻² s) / A, which simplifies to kg m s⁻³ A⁻¹. This is the correct SI unit for electric field strength. Choice D is incorrect because it does not match the SI unit for electric field strength.

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Physical Quantities and Units | 2014 - O/N - 9702/11 | Q2