AIPMT | 2014Current Electricity and Electrical InstrumentHard
Question
The resistances in the two arms of the meter bridge are 5 Ω and R Ω , respectively. When the resistance R is shunted with an equal resistance, the new balance point is at 1.6 I1. The resistance R, is :
Options
A.10 Ω
B.15 Ω
C.20 Ω
D.25 Ω
Solution
Initially, 
.....(i)
Finally,
.....(ii)
⇒
⇒ 160 - 1.6 l1 = 200 - 3.2 l1
⇒ 1.6 l1 = 40
⇒ l1 = 25
From Equation (i),
⇒ R = 15 Ω
.....(i)Finally,
.....(ii)⇒
⇒ 160 - 1.6 l1 = 200 - 3.2 l1
⇒ 1.6 l1 = 40
⇒ l1 = 25
From Equation (i),
⇒ R = 15 Ω
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