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A 10m long potentiometer wire has a resi...

A 10m long potentiometer wire has a resistance of 20 ohm. It is connected in series with a battery of emf 3V and a resistance of `10Omega`. The internal resistance of cell is negligible. If he length can be read accurately up 10 1mm, the potentiometer can read voltage.

A

uo to minimum of 0.2 mV

B

with an accuracy of 0.2 mV

C

with an accuracy of 0.1 mV

D

up to maximum of 2V

Text Solution

Verified by Experts

The correct Answer is:
B, D
Curent in wire `= (3)/(30)=0.1A`
`V =IR =2V`
maximum voltage can read `=2V`
`lamda = (V)/(l) = (2)/(10 xx 10^(3)) = 0.2 mV//mm`
least account of scale = 1mm
accuracy = 0.2 mV.
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