Multiple choice

A copper of length 36 m and diameter 2 mm is melted were to form a sphere. the radius of the sphere (in cm) is- 36 मीटर लम्बा तथा 2 मि.मी व्यास वाले तार को पिघलाकर एक गोला बनाया गया। गोले की त्रिज्या (सेमी.) में ज्ञात करें?

  1. 2.5

  2. 3

  3. 3.5

  4. 4
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

Copper wire is cylindrical with r = 1 mm, h = 36 m = 36000 mm. Volume = π(1)²(36000) = 36000π mm³. For sphere with same volume: (4/3)πR³ = 36000π, giving R³ = 27000, so R = 30 mm = 3 cm.

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