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A fuse made of lead wire has an area of ...

A fuse made of lead wire has an area of cross-section `0.2mm^(2)`. On short circuiting. The current in the fuse wire reaches 30A. How long after the short circulting will the fuse begin to melt? For lead, specific heat `0.032 "cal" g^(-1) .^(@)C^(-1)`, melting point `=327^(@)C`, density =`11.34g cm^(-3)` and the resistivity `=22xx10^(-6)Omega`cm. Initial temperature of the wire is `20^(@)C`. Neglect heat losses.

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A fuse made of lead wire has an area for cross-section 0.2mm^(2) . On short circuiting will the fuse wire reaches 32 A. How long after the short circuiting will the fuse begin to melt? For lead, specific heat capacity 134J kg^(-1)K^(-1) , melting point = 327^(@)C , relative density =11.34, initial temperature = 20^(@)C electricaL resistivity =11xx10^(-8)Omegam .

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