NEET Physics Resistance & Resistivity MCQ Question
In a Wheatstone bridge, if the resistances R1, R2, and R3 are known to be 10 Ω, 20 Ω, and 15 Ω respectively, what should be the value of R4 for the bridge to be balanced?
30 Ω
7.5 Ω
10 Ω
25 Ω
Correct Answer
Detailed Explanation
Using the Wheatstone bridge balance condition R1/R2 = R3/R4, we get 10/20 = 15/R4, which gives R4 = 7.5 Ω.
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