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In a meter bridge experiment, null point is obtained at 20cm 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?

a)

50 cm

b)

80 cm

c)

40 cm

d)

70 cm


Question ID - 151254 | Toppr Answer

In a meter bridge experiment, null point is obtained at 20cm 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?

a)

50 cm

b)

80 cm

c)

40 cm

d)

70 cm

1 Answer - 5876 Votes

3537

Answer Key : (a) -

(a)

Meter bridge is an arrangement which works on Wheatstone’s principle, so the balancing condition is

Where

Ist case

IInd Case Let the position null point is obtained at a distance  from same end.

So, from Eq. (i) 

Therefore, form Eqs. (i) and (ii)

Hence,   =50cm



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