FM19 P12 Q36 Current vs Internal Resistance Graph | Feb/Mar 2019 | CAIE A Level 9702 Physics

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9702/12/F/M/19: A cell of internal resistance r and electromotive force (e.m.f.) E is connected in series with a resistor of resistance R. The resistance R and the e.m.f. E remain fixed. The internal resistance r of the cell changes over time.

Which graph best shows the variation of the current I in the circuit with the internal resistance r? #9702m19p12 #ASinternalResistanceP1 #ASphysicsGraphsP1 #Lv2

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By solving this question, you proved that you're one of the best teachers of A levels .. no doubt

cpher
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Wow this reasoning is so cool, it applies transformation of functions 😨
But I think there is a quicker way to find the answer:
to keep the resistance R the same, the terminal volatge should also be constant (V=IR and across a component; I is constant... maybe?)
and to maintain stable terminal volatge, the lost volt should be constant too
V=Ir, and since V is constant, I proportional to 1/r; so the graph should be an inversely proportional graph
I don't know if this is correct... 😥

BOBO_
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Hello Mam, I have a doubt, in the I=E/R+r graph why doesn't it have the same intersection point? Won't current be the same when r=0?

tharusiapunithavel