What is the reason for partial differentiation in the proof of propagation of errors in parallel combination of resistors

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Q. The V-I graph for a series combination and for a parallel combination of two resistors is shown in the figure. Out of A and B, which one represents the parallel combination? Give a reason for your answer.

Question 22
Draw a circuit diagram of an electric circuit containing a cell, a key, an ammeter, a resistor of 2 $Ω$ in series with a combination of two resistors (4 $Ω$ each) in parallel and a voltmeter across the parallel combination. Will the potential difference across the 2 $Ω$ resistors be the same as that across the parallel combination of 4 $Ω$ resistors? Give reason.

The V-I graph for a series combination and for a parallel combination of two resistors is as shown in the figure below:

Which one of these represent parallel connection.

Q. (a) What is meant by the 'series combination' and 'parallel combination' of resistors? Explain with diagrams.
(b) What is the combined resistance of the three resistors of 5 Ω, 3 Ω and 2 Ω connected as shown in the figure?

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