The correct answer is A. Lorentz method.
The Lorentz method is a method for measuring the absolute resistance of a conductor. It is based on the principle that the magnetic field produced by a current flowing in a conductor is proportional to the current. The magnetic field is measured using a Hall probe, and the resistance is calculated from the measured field and the current.
The Raleigh method is a method for measuring the relative resistance of two conductors. It is based on the principle that the resistance of a conductor is proportional to its length and inversely proportional to its cross-sectional area. The resistance of the two conductors is measured using a Wheatstone bridge, and the relative resistance is calculated from the measured resistances.
Ohm’s law is a law that states that the current through a conductor is proportional to the voltage across it, provided that the temperature and other physical conditions remain constant. Ohm’s law cannot be used to measure the absolute resistance of a conductor, because it does not take into account the effects of temperature and other physical conditions.
The Wheatstone bridge is a circuit that is used to measure the resistance of an unknown resistor. The bridge is balanced when the voltage across the unknown resistor is equal to the voltage across a reference resistor. The resistance
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