Rankers Physics

Measuring Devices ( Galvanometer, Voltmeter and Ammeter & Meter Bridge ): Practice Problem & Solution

The potentiometer is best for measuring voltage, as: (2000)
It has a sensitive galvanometer and gives null deflection
It has wire of high resistance
It measures p.d. like in closed circuit
It measures p.d. like in open circuit

Solution Explained:

To solve this problem, we apply the core principles of Measuring Devices ( Galvanometer, Voltmeter and Ammeter & Meter Bridge ). Understanding the underlying formula is key to arriving at the correct answer below:

At the balancing point, no current is drawn from the secondary circuit by the potentiometer.
Thus, it acts as an ideal voltmeter with infinite resistance.
It measures potential difference across open circuit conditions without disturbing the circuit.

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