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Case1... if R is increased then the current in the circuit will decrease. Due to decrease in current the potential gradient across the wire will also decrease. By the relation V = l.k or l = V/k
on decrease in value of k or potential gradient the length of AX will increase or the balance point will shift towards B.
Case2... there will be no effect of value of S on balance point. The current through the resistance S is 0 at balance point hence it will not change the null point position.
Case3... on decreasing value of P the Potential though the wire will decrease and hence by the relation V = l.k or l = V/k
when potential of wire is decreased the length of segment AX will also decrease or the null point will shift towards A. Or when it made lower than Q the point will not be gained on wire.
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Explanation:
Data are units of information, often numeric, that are collected through observation. In a more technical sense, data are a set of values of qualitative or quantitative variables about one or more persons or objects, while a datum (singular of data) is a single value of a single variable.