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Physics - Current Electricity Question with Solution | TestHub

PhysicsCurrent ElectricityElectrical instrumentMedium2 minQB

PhysicsMediumsingle choice

In a meter bridge experiment, three different known resistors $R_{1}$ , $R_{2}$ and $R_{3}$ give null points at 15 cm, 55 cm and 85 cm respectively for the same unknown resistor $X$ . Which known resistor gives the most accurate value of $X$ ?

Options:

Answer:

Solution:

The null point nearest the middle of the wire (50 cm) has the least percentage error in the balance length.

$R_{2}$ gives the null point at 55 cm, closest to the middle, so $R_{2}$ is most accurate.

Stream:JEESubject:PhysicsTopic:Current ElectricitySubtopic:Electrical instrument

⏱ 2mℹ️ Source: QB

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