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The measurement of an unknown resistance...

The measurement of an unknown resistance R is to be carried out using wheatstone bridge(see Fig. EP 3.10). Two students perform an experiment in two ways. The first student takes `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 takes `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 `R_2` and `R_1` can be measured.

C

If the student uses large values of `R_2` and `R_1`, the currents through the arms will be feeble. This wil make determination of null point accurately more difficult.

D

wheatstone bridge is a very accuracy instrument and has no errors of measurement.

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