NEET · Physics · STD 12 - 3. 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 and are small
- B should be very large and unequal
- C do not play any significant role
- D should be approximately equal to \(2 X\)
Answer & Solution
Correct Answer
(A) should be approximately equal and are small
Step-by-step Solution
Detailed explanation
Resistance of \(P \& Q\) should be approx. equal as it decreases error in experiment.
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