[vẬt lÍ 11]

N

noinhobinhyen

$R_{tđ} = \dfrac{2R}{2+R}$

$I=\dfrac{E}{r+R_{tđ}} = \dfrac{15}{1+\dfrac{2R}{2+R}}$

$P_{R} = I^2.R = (\dfrac{15}{1+\dfrac{2R}{2+R}})^2.R$

tìm max cái đó
 
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