Physics · Electric Current and Circuits
यदि किसी समरूप चालक तार की लंबाई को उसकी अनुप्रस्थ काट के क्षेत्रफल को स्थिर रखते हुए बढ़ाया जाए, तो उसका विद्युत प्रतिरोध—
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