विद्युतरोधाचे (R) हा वाहकतारेच्या लांबीवरील (l) अवलंबन कशाप्रकारे दर्शविले जाते?

1
\(R \propto \frac{1}{l}\)
2
\(R \propto l\)
3
\(R \propto \frac{1}{l^2}\)
4
\(R \propto l^2\)

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