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  • Need clarity, kindly explain! - Current Electricity - JEE Main-2

In a meter bridge, as shown in the figure,
it is given that resistance Y=12.5 Ω and
that the balance is obtained at a distance
39.5 cm from end A (by Jockey J). After
interchanging the resistances X and Y, a
 new balance point is found at a distance l_{2} from end A. What are the values of X
and l_{2} ?

  • Option 1)

    8.16 Ω and 60.5 cm

  • Option 2)

    19.15 Ω and 39.5 cm

  • Option 3)

    8.16 Ω and 39.5 cm

  • Option 4)

    19.15 Ω and 60.5 cm

 

Answers (2)

best_answer

As we learned

 

Meter bridge -

To find the resistance of a given wire using a meter bridge and hence determine the specific resistance of its materials

- wherein

 

 For a balanced meter bridge

 

y\times 39.5 = x\times (100-39.5)

x=\frac{12.5\times 39.5}{60.5}= 8.16\Omega


Option 1)

8.16 Ω and 60.5 cm

Option 2)

19.15 Ω and 39.5 cm

Option 3)

8.16 Ω and 39.5 cm

Option 4)

19.15 Ω and 60.5 cm

Posted by

Plabita

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