JEE Main 2019 — Current Electricity Question with Solution
From: JEE Main 2019 (Online) 11th January Morning Slot
Question
In a Wheatstone bridge(see fig.), Resistances P and Q are approximately equal. When R = 400 , the bridge
is balanced. On interchanging P and Q, the value of R, for balance, is 405 . The value of X is close to :
This question includes a diagram. The text above accompanies the figure.
Choose an option
Show full solutionCorrect option: A
Correct answer
A402.5 ohm
Step-by-step explanation
For a balanced bridge,
......(i)
After interchanging P and Q,
......(ii)
Multiplying equation (i) and (ii), we get
X2 = 400405
X = = 402.5
......(i)
After interchanging P and Q,
......(ii)
Multiplying equation (i) and (ii), we get
X2 = 400405
X = = 402.5
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