First slide

Electrical measuring instruments

Question

If we use $100 Ω$ and $200 Ω$ in place of R and X we get null point deflection, l=33 cm . If we interchange the resistors, the null point length is found to be 67 cm. Find end corrections $α$ and $β$ .

Moderate

A

1 cm
B

2cm
C

3cm
D

4cm

Solution

$α = \frac{R_{2} l_{1} - R_{1} l_{2}}{R_{1} - R_{2}} = \frac{(200) (33) - (100) (67)}{100 - 200} = 1 cm$
$β = \frac{R_{1} l_{1} - R_{2} l_{2}}{R_{1} - R_{2}} - 100$
$= \frac{(100) (33) - (200) (67)}{100 - 200} - 100$
= 1 cm

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