Which of the following pairs have the same units and dimensions?
Correct answer: C. Electromotive force and potential difference
- A. Resistance and resistivity
- B. Conductivity and resistivity
- C. Electromotive force and potential difference
- D. Resistivity and temperature coefficient of resistivity
Explanation
The correct answer is Option C: Electromotive force and potential difference. Both are measured in volts (V) and have the same dimensions. EMF represents the energy provided per coulomb of charge, while potential difference measures the energy used per coulomb as it moves between two points.Option A is incorrect because resistance and resistivity have different units. Resistance is in ohms (Ω), whereas resistivity is in ohm-meters (Ω⋅m).Option B is incorrect because conductivity and resistivity are inversely related but have different units; conductivity is in siemens per meter (S/m) and resistivity is in ohm-meters (Ω⋅m).Option D is incorrect because resistivity and the temperature coefficient of resistivity have different units; resistivity is in ohm-meters (Ω⋅m) and the temperature coefficient of resistivity is in per degree Celsius (1/°C).
This question appeared on the ETEA MDCAT 2012 paper, which you can sit online with every answer explained.
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About Steady Current
Steady current is the continuous flow of charge at a constant rate through a conductor. The topic covers current, charge, potential difference, resistance, Ohm's law, resistivity and electrical power, along with series and parallel circuits, while distinguishing conventional current direction from electron motion.
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