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If emf of battery is 100V, then what was...

If `emf` of battery is `100V`, then what was the resistance of Rheostat adjusted at reading (`i=2A`, `V=20V`)

A

`10 Omega`

B

`20 Omega`

C

`30 Omega`

D

`40 Omega`

Text Solution

Verified by Experts

The correct Answer is:
D
from the curve slope `=(1)/(v)=(1)/(R )=(1)/(10)`
, `R=10Omega`
for second reading
`i=(Emf)/(R+R_(rh)implies 2=(100)/(10+R_(rh))impliesR_(rh)=40Omega`
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