Neet Solved Paper 2015 Question 29
Question: A, B and C are voltmeters of resistance R, 1.5R and 3R respectively as shown in the figure. When some potential difference is applied between X and Y, the voltmeter readings are $ V _{A},V _{B} $ and $ V _{C} $ respectively. Then,
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Options:
A) $ V _{A}=V _{B}=V _{C} $
B) $ V _{A}\ne V _{B}=V _{C} $
C) $ V _{A}=V _{B}\ne V _{C} $
D) $ V _{A}\ne V _{B}\ne V _{C} $
Show Answer
Answer:
Correct Answer: A
Solution:
- The equivalent resistance between Q and S is given by $ \frac{1}{R’}=\frac{1}{1.5R}+\frac{1}{3R}=\frac{2+1}{3R} $
$ \Rightarrow ,R’=R $ Now, $ V _{PQ}=V _{A}+IR $ Also $ V _{QS}=V _{B}=V _{C}=IR $ Hence, $ V _{A}=V _{B}=V _{C} $
