Explanation
For portion CD slope of the curve is negative i. e., resistance is negative.
To make range n times, the galvanometer resistance should be G/n,, where G is initial resistance.
It is quite clear that in a battery circuit, the point of lowest potential is the negative terminal of the battery and the current flows from higher potential to lower potential.
The resistance of the galvanometer is fixed. In meter bridge experiments, to protect the galvanometer from a high current, high resistance is connected to the galvanometer in order to protect it from damage.
A resistor, a voltmeter and an ammeter is required to test ohm’s law.
Voltmeter is made by connecting a high resistance in series with galvonometer. An ammeter is made by connecting a low resistance in parallel with galvonometer. Voltmeter is connected in parallel and ammeter is connected in series with the test resistor.
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