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Solution


Q.

A wheatstone bridge is used to determine the value of unknown resistance X by adjusting the variable resistance Y as shown in the figure. For the most precise measurement of X, the resistances P and Q                  [2022]
1 should be approximately equal to 2X.  
2 should be approximately equal and are small  
3 should be very large and unequal  
4 do not play any significant role  

Ans.

(2)

For a balanced Wheatstone bridge, current through a galvanometer is zero.

∴   PQ=XY

Here resistances P and Q should be approximately equal and small, as it decreases error in experiment.