Home
Class 12
PHYSICS
A thin uniform wire AB of length 1 m, an...

A thin uniform wire `AB` of length `1 m`, an unknown resistance `X` and a resistance of `12 Omega` are connected by thick conducting strips, as shown in the figure. A battery and a galvanometer (with a sliding jockey connected to it) are also available. Connections are to be made to measure the unknown resistance `X`. Using the principle of Wheatstone bridge answer the following questions :
(a) Are there positive and negative terminals on the galvanometer?
(b) Copy the figure in your answer book and show the battery and the galvanometer (with jockey connect at appropriate points.
(c) After appropriate connections are made, it is found that no deflection takes place in th, from galvanometer when the sliding jockey touches the wire at a distance of `60 cm` from `A`. Obtain value of the resistance X.

Text Solution

Verified by Experts

The correct Answer is:
A, C

a. There are no positive and negative terminals on the galvanometer because only zero deflection is needed.

c. `Aj=60 cm implies BJ=40cm`
if no deflection is taking place. Then the Wheatstone bridge is said to be balanced.
hence, `X/12, R_(BJ)/R_(AJ)` or `X/12=40/60=2/3`
or `X=Omega`
Doubtnut Promotions Banner Mobile Dark
|

Topper's Solved these Questions

  • CURRENT ELECTRICITY

    DC PANDEY ENGLISH|Exercise Example|65 Videos
  • CURRENT ELECTRICITY

    DC PANDEY ENGLISH|Exercise Check point|70 Videos
  • CURRENT ELECTRICITY

    DC PANDEY ENGLISH|Exercise Level 2 Comprehension Example Type|2 Videos
  • COMMUNICATION SYSTEM

    DC PANDEY ENGLISH|Exercise Subjective|11 Videos
  • ELECTROMAGNETIC INDUCTION

    DC PANDEY ENGLISH|Exercise Medical entrances gallery|25 Videos