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The measurement of an unknown resistance...

The measurement of an unknown resistance R is to be carried out using Wheatstone's bridge. Two students perform an experiment in two ways. The first student `R_2 = 10 Omega` and `R_1 = 5 Omega` the other student takes `R_2 = 1000 Omega` and `R_1 = 500 Omega` . In the standard arm ,both take `R_3 = 5 Omega` . Both find `R = [R_2/R_1] R_3 = 10 Omega ` within errors

A

The errors of measurement of the two students are the same

B

Errors of measurement do depend on the accuracy with which R2 and R1 can be measured

C

If the student uses large values of R2 and Rj, the currents through the arms will be large. This will make determination of null point accurately more easy

D

Wheatstone bridge is a very accurate instrument and has no error of measurement

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