Question

50. 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 (1) 9 m (2) 18 m (3) 27 m - (4) 36 m

11th - 12th Class

Maths

Solution

191

2.7 (11 ratings)

50. (4) Here, the volume of sphere ( = ) the volume of wire ( frac{4}{3} pi 3^{3}=pi times(0.1)^{2} times h ) ( Rightarrow quad h=frac{36}{0.01}=3600 mathrm{cm}=36 mathrm{m} )