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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 :
A
do not play any significant role
B
should be approximately equal to 2X
C
should be approximately equal and are small
D
should be very large and unequal
Detailed Solution
A Wheatstone bridge is most sensitive when all four resistances are of the same order.
So for the most precise measurement of X, P and Q should be approximately equal (and small), which reduces the error in the experiment.