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A fuse with a circular cross - sectional...

A fuse with a circular cross - sectional radius of ` 0.15 mm` blows at `15 A`. What should be the radius of the cross section of a fuse made of the same material that blows at `30 A`?

Text Solution

Verified by Experts

For fuse wire `Ipropr^(2//3)`
so `(r_(2))/(r_(1))`=`((I_(2))/(I_(1)))^(2//3)`=`((120)/(15))^(2//3)`=`(8)^(2//3)`=4`rArr` `r_(2)`=`4r_(1)`=0.60mm
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