A resistance R is to be measured using a metre bridge. Student chooses the standard resistance S(right gap) to be 100 $Ω$ . He finds the null point at l₁= 2.9 cm. He is told to attempt to improve the accuracy. Which of the following is a useful way ?

see full answer

Your Exam Success, Personally Taken Care Of

1:1 expert mentors customize learning to your strength and weaknesses – so you score higher in school , IIT JEE and NEET entrance exams.

An Intiative by Sri Chaitanya

He should change S to 1000 $Ω$ and repeat the experiment

He should change S to 3 $Ω$ and repeat the experiment.

He should measure l₁ more accurately

He should give up hope of a more accurate measurement with a metre-bridge

answer is C.

(Unlock A.I Detailed Solution for FREE)

Best Courses for You

JEE

NEET

Foundation JEE

Foundation NEET

CBSE

Detailed Solution

The best measurements are taken when the null point in obtained around the mid point of the wire when resistances in the left and right gap are nearly equal . Since the length measurement l₁is very small , the resistance of the left gap should be increased or right gap should be reduced .

Watch 3-min video & get full concept clarity