IIT-JEE 2011 · Paper 1 · Physics Q29

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PhysicsSingle correct+3 / -1Question 29 of 69

A meter bridge is set-up as shown, to determine an unknown resistance 'X' using a standard 10 ohm resistor. The galvanometer shows null point when tapping-key is at 52 cm mark. The end-corrections are 1 cm and 2 cm respectively for the ends A and B. The determined value of 'X' is

Metre bridge: X in the left gap and 10 Ω in the right gap; a cell across the ends; a galvanometer from the middle junction to a jockey on the wire AB (A on the left).

10.2 ohm

10.6 ohm

10.8 ohm

11.1 ohm

Answer and worked solution

Official answer: B

Corrected lengths. $52+1=53$ cm and $48+2=50$ cm.

Balance. $\dfrac X{10}=\dfrac{53}{50}$ , so $X=10.6\ \Omega$ .

(B)

Topics:Wheatstone bridge and metre bridge Errors in measurement

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IIT-JEE 2011 · Paper 1, Physics question 29