Physics - Error Question with Solution | TestHub

PhysicsErrorMiscellaneousMedium2 minQB

PhysicsMediumsingle choice

In a metre bridge experiment, we try to obtain the null point near the middle. This:

Answer:

Solution:

$R \propto \frac{l}{100 - l}$ .

$\frac{Δ R}{R} = \frac{100Δ l}{l ( 100 - l )}$ .

$l (100 - l)$ is largest at $l = 50 cm$ , minimizing random reading-error sensitivity.

With equal bridge arms, symmetric end/contact corrections largely cancel in the resistance ratio, reducing systematic error.

Therefore A is correct.

Stream:JEESubject:PhysicsTopic:ErrorSubtopic:Miscellaneous

⏱ 2mℹ️ Source: QB

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