Question Details

Which of the following quantities can be written in SI units in kgm²A⁻² s⁻³?

Options

A

Resistance

B

Inductance

C

Capacitance

D

Magnetic flux

Correct Answer :

Resistance

Solution :

The correct option is Resistance.

To determine which physical quantity has the SI unit kgm2A-2s-3, we can derive the units of Resistance step-by-step from fundamental physical relationships.

1. According to Ohm's law, electrical resistance (R) is the ratio of potential difference (V) to electric current (I):
R=VI

2. Potential difference (V) is defined as the work done (W) per unit charge (q):
V=Wq

3. The SI unit of work done (W) is the Joule (J). In base SI units, work is force times distance:
J=kgm2s-2

4. The SI unit of electric charge (q) is the Coulomb (C), which is equivalent to current (I) multiplied by time (t):
C=As

5. Substituting the base units of work and charge back into the formula for potential difference (V):
Unit of V=kgm2s-2As=kgm2s-3A-1

6. Finally, substituting this back into the formula for resistance (R=VI) by dividing the unit of potential difference by the unit of current (Ampere, A):
Unit of R=kgm2s-3A-1A=kgm2A-2s-3

Thus, the quantity that corresponds to the given SI units is Resistance.

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