The circuit that follows is for a laboratory potentiometer for measuring unknown voltages V x ….

The circuit that follows is for a laboratory potentiometer
for measuring unknown voltages Vx.

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Assume the resistor AB is a slide wire whose resistance is
directly proportional to its length. With the standard Weston cell (1.018 V) in
the circuit, a null point was observed when contact C was moved to a position
84.3 cm from point A. When the Weston cell was replaced with a cell of an
unknown voltage Vx, null was observed at 44.3 cm. Find the value of
Vx.

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