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  • The measurement of an unknown resistance R is to be carried out using Wheat stones bridge (see Figure of NCERT Book). Two students perform an experiment in two ways.

The measurement of an unknown resistance R is to be carried out using Wheat stones bridge (see Figure of NCERT Book). Two students perform an experiment in two ways. The first students take R_2 = 10\Omega and R_1 = 5\Omega. The other student takes R_2 = 1000\Omegaand R_1 = 500\Omega. In the standard arm, both take R_3= 5\Omega. Both find R=\frac{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 will make determination of null            point accurately more difficult.
D. Wheatstone bridge is a very accurate instrument and has no errors of measurement.

Answers (1)

The correct answers are the options (b,c)

Explanation: Using large values of R_{1} and R_{2} , will reduce the current flowing through the system, making it difficult to get accurate readings from the galvanometer.

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