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Question:

In a meter bridge experiment, the circuit diagram and the corresponding observation table are shown in figure. SI.No. R(Ω) l(cm) 1. 1000 60 2. 100 13 3. 10 1.5 4. 1 1.0 Which of the readings is inconsistent?

4

1

3

2

Solution:

as x = R(100-l)/l
for (1) x = 1000 × (100-60)/60 ≈ 667
for (2) x = 100 × (100-13)/13 ≈ 667
for (3) x = 10 × (100-1.5)/1.5 ≈ 656
for (4) x = 1 × (100-1)/1 ≈ 99