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JEE Advanced2011PhysicsCurrent ElectricityActual

A meter bridge is set up as shown in figure, to determine an unknown resistance X using a standard 10 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

Options

  1. A10.2
  2. B10.6
  3. C10.8
  4. D11.1

Correct answer

B. 10.6

Step-by-step solution

Using the concept of balanced Wheatstone bridge, we have array rlrl & P Q & = R S & & X (52+1) & = 10 (48+2) & & X & = 10 53 50 =10.6 array Correct option is (b). Analysis of Question Question is moderately tough, because normally end corrections are not taught in the coaching/schools in this type of problem.

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