Current Electricity Charging Discharging Of Capacitors Question 741
Question: The resistances in the two arms of the meter bridge are $ 5\Omega $ and $ R\Omega $ , respectively. When the resistance R is shunted with an equal resistance, the new balance point is at $ 1.6l _{1}. $ The resistance R is:
Options:
A) $ 10\Omega $
B) $ 15\Omega $
C) $ 20\Omega $
D) $ 25\Omega $
Show Answer
Answer:
Correct Answer: B
Solution:
[b] This is a balanced Wheatstone bridge condition, $ \frac{5}{R}=\frac{{\ell _{1}}}{100-{\ell _{1}}}\text{ and }\frac{5}{R/2}=\frac{1.6{\ell _{1}}}{100-1.6{\ell _{1}}} $
$ \Rightarrow R=15\Omega $
BETA
