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Asked in JEE Main 2005 · Terminal voltage and internal resistance
Current into the load: I=E/(R+r).
If r R, then I≈E/r, which does not change when the load R changes: a constant-current source.
If r=0, the terminal voltage stays constant, but I=E/R changes with the load.
Printed key is option (a), but the physics of a constant-current source gives option (d).
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