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Two students ‘X’ and ‘Y’ perform an expe...

Two students ‘X’ and ‘Y’ perform an experiment on potentiometer separately using the circuit given: Keeping other parameters unchanged, how will the position of the null point be affected it
(i) X’ increases the value of resistance R in the set-up by keeping the key `K_1` closed and the key `K_2` open?
(ii) Y’ decreases the value of resistance S in the set-up, while the key `K_2` remain open and the key `K_1` closed? Justify.

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