KVPY2017PhysicsCurrent Electricity
In the circuit shown below (on the left) the resistance and the emf source are both variable. The graph of seven readings of the voltmeter and the ammeter (V and I, respectively) for different setting of resistance and the emf, taken at equal intervals of time t , are shown (on the right) by the dots connected by the curve EFGH. Consider the interval resistance of the battery to be negligible and the voltmeter and am
Correct answer
3
Step-by-step solution
From E F Slope is constant V= R Thus R must be constant R ₀= V ₀ / I ₀ Frorm F G V = constant I is increase thus R must be decrease. at G, R= V₀ 2 I₀ = R₀ 2 From G H I = constant V = increase, thus R must be increase R _ H = 2 ~V ₀ 2 l ₀ = R ₀