Browse by Stream
QnA
Home
QnA
Go To Your Study Dashboard

Get Answers to all your Questions

header-bg qa
  • Home
  • Engineering
  • Tell me? In a metre bridge experiment null point is obtained at 20 cm from one end of the wire when resistance X is balanced against another resistance Y .If X<Y , then where will be the new position of the null point from the same end, if one dec

In a metre bridge experiment null point is obtained at 20 cm from one end of the wire when resistance X  is balanced against another resistance  Y .If X<Y  , then where will be the new position of the null point from the same end, if one decides to balance a resistance of  4X against Y ?

  • Option 1)

    50 cm

  • Option 2)

    80 cm

  • Option 3)

    40 cm

  • Option 4)

    70 cm

 

Answers (2)

As we learnt in

Wheat stone Bridge -

It is an arrangement of four resistances which can be used to measure one of them in terms of rest

- wherein

 

 \frac{R_{1}}{R_{1}}=\frac{l_{1}}{l_{2}}=\frac{l_{1}}{(100-l_{1})}

In first case, \frac{x}{y}=\frac{20}{100-20}=\frac{20}{80}=\frac{1}{4}

In second case, \frac{4x}{y}=\frac{l}{100-l}=\frac{4}{4}=\frac{l}{100-l}

l = 50 cm


Option 1)

50 cm

This option is correct.

Option 2)

80 cm

This option is incorrect.

Option 3)

40 cm

This option is incorrect.

Option 4)

70 cm

This option is incorrect.

Posted by

Sabhrant Ambastha

View full answer

JEE Main high-scoring chapters and topics

Study 40% syllabus and score up to 100% marks in JEE

Similar Questions

Trending Articles/News

anam-khan

JEE Main 2024 Topper: Farmer’s son Gajare Nilkrishna says ‘keep questioning until you understand’
anam-khan

NIT Puducherry Cut-off 2024: Computer Science and Engineering had highest closing rank last year
anam-khan

What after JEE Main results 2024? All you need to know about JEE Adv, CSAB, JoSAA counselling

Latest Question