A copper sphere of radius 3 cm is beaten and drawn into a wire of diameter 0.2 cm. The length of the wire is-

Question: A copper sphere of radius 3 cm is beaten and drawn into a wire of diameter 0.2 cm. The length of the wire is-Solution:ব্যাসার্ধ, r = 3 সেমিগোলকটির আয়তন = (4/3) × π × r3= (4/3) × π × 33= 36πতারটি ব্যাসার্ধ = 0.2/2 = 0.1 সেমিতারটির আয়তন = πr2l= π × (0.1)2 × l= 0.01πlশর্তমতে,0.01πl = 36π⇒ l = 36/0.01⇒ l = 3600 cm⇒ l = 36 m