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in Physics by (25.3k points)
200 वोल्ट का एक बल्ब 0.2 ऐम्पियर की धारा लेता है । इसके तन्तु की लम्बाई 22 सेमी है । तन्तु के पदार्थ का विशिष्ट प्रतिरोध `7xx10^(-5)` ओम - सेमी है । तार के व्यास की गणना कीजिए ।

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