Questions
A fuse wire with a circular cross-sectional radius of 0.02 mm blows with a current of 5 ampere. For what current, another fuse wire made from the same material with cross-sectional radius of 0.04 m wiII blow ?
detailed solution
Correct option is D
We know that the safe current for a fuse ∝r3/2where r is the radius of fuse wire.∴ i2i1=r2r13/2i1 = 5amp.,r1 = 0.02mm and r2 = 0.04mm∴ i25=0⋅040⋅023/2=8or i2=58=102=14⋅7ampTalk to our academic expert!
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