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Last Updated On 01-06-2023 - By Jeesha Sara

The resistance of the meter bridge AB is given figure is 4. With a cell of emf ε=0.5 V and rheostat resistance Rh= 2 the null point is obtained at some point J. When the cell is replaced by another one of emf ε= the same null point J is found for Rh=6 . The emf  is ;

(a)

0.6 V

(b)

0.5 V

(c)

0.3 V

(d)

0.4 V


Question ID - 50312 :-

The resistance of the meter bridge AB is given figure is 4. With a cell of emf ε=0.5 V and rheostat resistance Rh= 2 the null point is obtained at some point J. When the cell is replaced by another one of emf ε= the same null point J is found for Rh=6 . The emf  is ;

(a)

0.6 V

(b)

0.5 V

(c)

0.3 V

(d)

0.4 V

1 Answer
5876 Votes
3537

Answer Key : (c) -

Potential gradient with Rh =2 is ×=L=100cm

Let null point be at cm

 Thus =0.5V=……(1)

Now with Rh = 6

 and at null point

  …...(2)

Dividing equation (1) by (2) we get

 thus



Next Question :

The given graph shows variation (with distance r from centre) of :

(a) Potential of a uniformly charged sphere

(b) Potential of a uniformly charged spherical shell

(c) Electric field of uniformly charged spherical shell

(d) Electric field of uniformly charged sphere


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