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Question

Four students measured the reading by observing the position of pointer on the ammeter scale as shown below:



Assuming that the ammeter has no zero error, the correct reading is :
(1) 1.25 A
(2) 1.30 A
(3) 1.15 A
(4) 1.1 A

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Solution

Total number of divisions on the scale = 30
The maximum value that can be measured = 1.5 A

Least count = 1.5 A30=0.05 A

Ad there is no zero error, so the Correct reading of the scale = 23×0.05 A= 1.15 A

Hence the correct option is Option 3.

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