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A cell of internal resistance r drivers...

A cell of internal resistance r drivers current through an external resistance R. The power delivered by the to the external resistance will be maximum when:

A

R=0.001r

B

R=1000r

C

R=2r

D

R=r

Text Solution

Verified by Experts

`i=E/(R+r), P=i^2R=(E^2R)/(R+r)^2`
For maximum power , `(dP)/(dR)=0 implies R=r`
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