a) Ta có: \(\dfrac{I_1}{I_2}=\dfrac{R_2}{R_1}=\dfrac{0,5I_2}{I_2}=0,5\)
\(\Rightarrow\dfrac{R_2}{R_1}=0,5\Rightarrow R_2=0,5R_1\)
\(I_1=0,5I_2\Rightarrow R_2=..0,5..R_1\)
b) Ta có: \(\dfrac{I_1}{I_2}=\dfrac{R_2}{R_1}=\dfrac{I_1}{0,4I_1}=2,5\)
\(\Rightarrow\dfrac{R_2}{R_1}=2,5\Rightarrow R_2=2,5R_1\)
\(I_2=0,4I_1\Rightarrow R_2=...2,5R_1...\)
c) Ta có: \(\dfrac{I_1}{I_2}=\dfrac{R_2}{R_1}=\dfrac{3R_1}{R_1}=3\)
\(\Rightarrow\dfrac{I_1}{I_2}=3\Rightarrow I_1=3I_2\)
\(R_2=3R_1\Rightarrow...I_1=3I_2...\)
d) Ta có: \(\dfrac{I_1}{I_2}=\dfrac{R_2}{R_1}=\dfrac{R_2}{2R_2}=0,5\)
\(\Rightarrow\dfrac{I_1}{I_2}=0,5\Rightarrow I_1=0,5I_2\)
\(R_1=2R_2\Rightarrow I_1=0,5I_2\)
a) Nếu I1 = 0,5I2 => R1 = 2R2
b) I2 = 0,4 I1 => R2 = 2,5 R1
c) R2 = 3R1 => I2 = 1/3 I1
d) R1 = 2R2 => I1 = 0,5I2