A fuse wire with radius of 0.2mm blows off with a current of 5 Amp. The fuse wire of same material, but of radius 0.3 mm will blow off with a current of
1) `5xx(3)/(2)" Amp"`
2) `(5sqrt3)/(2)" Amp"`
3) `5sqrt((27)/(8))" Amp"`
4) 5 Amp

Explanation

`i^(2)propr^(3), (i_(1))/(i_(2))=((r_(1))/(r_(2)))^(3//2)=((0.1)/(0.3))^(3//2)" "I,=5sqrt((27)/(8))" Amp"`