Question

What is the ratio of sum of volumes of two hemispheres of radius 1cm

each to the volume of a sphere of radius 1 cm?

a) 1:1 b) 1:8 c) 8 :1 d) 1:16​

Answer 1

a wire of length l and radiys r having resistance 10 radius of wire becomes half when we stretch the wire find bew resistance of wire