Question
Physics Question on Current electricity
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
Should be approximately equal to 2X
B
Should be approximately equal and are small
C
Should be very large and unequal
D
Do not play any significant role
Answer
Should be approximately equal and are small
Explanation
Solution
For the most precise measurement of x the resistance P and Q should be approximately equal and are small.