Question

What is The Null Point Of Galvanometer?

Answer 1

Hint: Null measurements balance voltages such that no current flows through the measuring device and, as a result, the circuit being tested does not change. Null measurements are more precise than ordinary voltmeters and ammeters, but they are also more complicated, and their precision is still limited. We'll look at a few different sorts of null measurements in this lesson since they're common and intriguing, and they help us understand more about electric circuits.

Complete step by step answer:
A galvanometer is an electric current measurement instrument that is electromechanical. Early galvanometers were uncalibrated, but later versions, known as ammeters, were calibrated and could more precisely detect current flow. A galvanometer responds to an electric current running through a coil in a constant magnetic field by deflecting a pointer. Galvanometers can be viewed as a type of actuator. A galvanometer is a device that detects or measures the magnitude of a tiny electric current. The movement of a magnetic needle or a coil in a magnetic field, which is an integral element of a galvanometer, is generally used to show the current and its strength.
When the potential drop across the potentiometer wire (which may be varied by moving the jockey) is the same as the potential drop across the cell in the circuit, we have a null point. It's presumed that the galvanometer in your instance has no resistance. The potential difference between the two would be zero when the potential drop across the wire matches the potential drop across the cell in the secondary circuit. According to Ohm's law, the current flowing through a conductor is proportional to the potential difference across it. There will be no current flow if there is no potential difference. As a result, the galvanometer has a null deflection.

Note:
Galvanometers have played an important role in the advancement of science and technology in a variety of disciplines. For example, in the 1800s, they permitted long-distance communication via underwater cables, such as the first transatlantic telegraph lines, and their precise current measurements were crucial in identifying the electrical activity of the heart and brain.