Browse by Stream
QnA
Home
QnA
Go To Your Study Dashboard

Get Answers to all your Questions

header-bg qa
  • Home
  • Engineering
  • A resistance of is connected across one gap of a metre-bridge (the length of the wire is <img alt="100 \mat

A resistance of 2 \Omega is connected across one gap of a metre-bridge (the length of the wire is 100 \mathrm{~cm} ) and an unknown resistance, greater than 2 \Omega, is connected across the other gap. When these resistance are interchanged, the balance point shifts by 20 \mathrm{cm}. Neglecting any corrections, the unknown resistance is

Option: 1

3\, \Omega


Option: 2

4\, \, \Omega


Option: 3

5\, \Omega


Option: 4

6 \, \Omega


Answers (1)

best_answer

For null condition in first case, \frac{2}{x}=\frac{1}{100-1} \text { or } 1x=200-21 \ldots . . .(1)

and for second case , \frac{x}{2}=\frac{1+20}{100-(1+20)}

or  \frac{x}{2}=\frac{1+20}{80-1}

or  80 x-1 x=21+40 \ldots . .(2)

 

Posted by

Gautam harsolia

View full answer

Similar Questions

Latest Question