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Question
If the metre bridge wire is not of uniform area of cross section, how will it affect the observations ?
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Solution
Dear Student,
The answer to your querie is as follows:
The area of cross-section of a wire need to be uniform beacuse if there is a change in area of cross-section of the wire, there will be a proportionate change in the resistance of a wire as resistance depends on the cross-sectional area.
As Resistance(R)=ρL/A., hence R is inversely proportional to the area of cross-section and hence if the area of cross-section is not unifrom then there will be change in the resistance of the wire.
Owing to this reading of the meter-bridge experiment to determine the unknown resistance will have error, hence the cross-sectional area of wire throughout its length must be uniform.
Regards
The answer to your querie is as follows:
The area of cross-section of a wire need to be uniform beacuse if there is a change in area of cross-section of the wire, there will be a proportionate change in the resistance of a wire as resistance depends on the cross-sectional area.
As Resistance(R)=ρL/A., hence R is inversely proportional to the area of cross-section and hence if the area of cross-section is not unifrom then there will be change in the resistance of the wire.
Owing to this reading of the meter-bridge experiment to determine the unknown resistance will have error, hence the cross-sectional area of wire throughout its length must be uniform.
Regards
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