10.9998
If the zero error is given by +.0002 units
and the final reading on a measuring device is 1 unit
What is the correct length?
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15 Answers
110.9998
this is due to the fact thatbecause 0 error is always subtracted from the measured length
62that is my question!
It comes from the definition of zero error!
1If the question was..........
If the zero error is given by -.0002 units
and the final reading on a measuring device is 1 unit
then d ans is 1.0002
11Zero Error is the deviation of the reading from zero. Therefore If the deviation is +x. The reading will be more by x. Therefore it has to be subtracted
62@virang
what do you mean deviation of the reading from zero!
least count has nothing to do with reading i guess.
I understand the "bhavna" of your answer though..
11Sir , I am not talking of least count out here. The explanation i gave is for the question why do we subtract the zero error .
11The zero error shows how much more or how much less the reading is, from the real value.....
When we get the head scale reference line above the 0 line:
There should have been some more rotations to make the coincidence but some internal problem caused it to 'tick' well before (hence negative 0 error) ..... so an xtra amount must be added to the reading to give the exact value (hence positive 0 correction)
For the other case (0 coming above the ref. line..) the problrm caused the 'tick' sometime after it should have come (hence positive 0 error) and so some value has to be taken off so as to get the correct reading (Hence negative 0 correction)
1i think what virang is sayong is that
a +..... zero error means that when the reading should have been zero ; it was "....." more than zero
then obviously the reading at any other point must also be "......" more than the actual reading at that point (unless the device contracts or expands :D )
hence we subtract "....." from the observed reading
24imp fact
zero error is always algebraically subtracted
and zero correction is always algebraically added[1][1]
if zero of scale lies to right of zero of main scale then positive error and if left then negative error.[1]