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 :

Question

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 2 X (C) should be approximately equal and are small (D) should be very large and unequal

Tardigrade Admin · Accepted Answer

Resistance of P Q should be approx. equal as it decreases error in experiment.

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 $Q$ :

do not play any significant role

should be approximately equal to $2 X$

should be approximately equal and are small

should be very large and unequal

Resistance of $P & Q$ should be approx. equal as it decreases error in experiment.

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 :