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A potentiometer wire of length 10m and r...

A potentiometer wire of length `10m` and resistance `20Omega` is connected in series with another resistance of `80Omega` and a battery of emf `4V`. The potential gradient on the wire will be (in `mV//cm`)

A

`0.8`

B

`0.16`

C

`0.2`

D

`0.4`

Text Solution

Verified by Experts

The correct Answer is:
A
`V_(1):V_(2)=R_(1):R_(2)=1:4impliesV_(1)=(1)/(5)(4)=0.8V`
`:.` Potential gradient `=(0.8)/(10)Vm^(-1)=0.08Vm^(-1)`
`=0.8mV cm^(-1)`
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