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Kuldeep Mukherjee Grade: 12
        a Copper wire having a cross sectional area of 0.05mm2 and a length of 0.1m is initially at 25 degree centigrade and is insulated from the surroundings. If a current of 10 A is set up in this wire,(a) find the time in which the wire will start melting.the change of the resistance of the wire with temperature must be neglected.

(b) what will this time be if the length of the wire is doubled?density of copper = 9*10^(3) Kg/m3 , Specific heat of copper =9*10^(-2) Cal/Kg/oC,melting point =1075 oC and specific resistance=1.6*10^(-8) ohm metre

6 years ago

Answers : (1)

SAGAR SINGH - IIT DELHI
879 Points
										

Dear student.


Use q=it


V=iR


and Resistivity=pl/A
























































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Sagar Singh


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6 years ago
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