MHT CET 2023 Physics question
Two resistance X and Y are connected in the two gaps of a meterbridge and the null point is obtained at 20 cm from zero end. When the resistance of 20 Ω is connected in series with the smaller of the two resistances X and Y, the null point shifts to 40 cm from left end. The value of smaller resistance on ohm is
Answer: (C)
Solution
Meter bridge: . With the null point at 20 cm, , so and is the smaller resistance. After adding 20 Ω in series with the null point is at 40 cm:
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