Qualification > Sciences

physics- electricity help

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7ooD:
do they ask such question in edexcel as

vanibharutham:
i have attached my method

its a bit different from astar's method, but works out to be the same i.e. R = r

cashem'up:
thanks........yea that does make sense mathemetically but how would u explain it theoritacally....... i mean wat is actually happening

astarmathsandphysics:
Thats what I meant by it being a mathematical answer. Because p=vi you have to maximise v and I but you cant do both and must use maths to do it.

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