Current Electricity 4 Question 16

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

(2011)

(a) 10.2Ω

(b) 10.6Ω

(c) 10.8Ω

(d) 11.1Ω

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Solution:

  1. Using the concept of balanced Wheat stone bridge, we have,

PQ=RSX(52+1)=10(48+2)X=10×5350=10.6Ω

Correct option is (b).



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