N A galvanometer has a internal resistance of 40 Ω.A shunt resistor of value 40 Ωand an unknown resistor R are connected in parallel with the galvanometer.A constantcurrent I0is passed through, and the galvanometer def l ects a certain amount.The resistorR is then removed, and replaced in series with the galvanometer, leaving the shunt inparallel with this series combination.With the same current I0, the galvanometer def l ectionis unchanged.Calculate the value R of the unknown resistor R

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Thevenin Theorem

Any linear circuit, no matter how complex, maybe simplified to an equivalent circuit utilizing only a single voltage source and series resistance coupled to a load, according to Thevenin's Theorem. The superposition principle says that all foundational equations must be linear, and the notion of "linear" is still the same (i.e., there should not be any exponentials or roots). This is particularly the case when operating with passive elements like resistors, inductors, and capacitors. However, some components (particularly some gaseous and semiconductor devices like tunnel diode, Schottky diode, transistors like BJT, MOSFET) are nonlinear, meaning their current resistance fluctuates with voltage and current. As a result, circuits made up of these parts are known as nonlinear circuits.