MHT CET 2022 Physics question
A resistance of is connected in the left gap of a meter bridge and an unknown resistance greater than is connected in the right gap. When these resistance are interchanged, the balance point shifts by 20 cm. The unknown resistance is
Answer: (D)
Solution
Let the unknown resistance be . Initially , so cm. After interchanging, , so cm. Since , the balance point moves towards the right, : $ = 20
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