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2mW = 2.10⁻³ W [latex]P = \frac{V^2 }{R} [/latex] [latex]2.10^-^3 = \frac{(12)^2 }{R} [/latex] [latex]R = \frac{(12)^2 }{2.10^-^3 } [/latex] [latex]R = \frac{144 }{2.10^-^3 } = 72000 ~ohm[/latex]
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