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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

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

Grade:12

1 Answers

SAGAR SINGH - IIT DELHI
878 Points
13 years ago

Dear student.

Use q=it

V=iR

and Resistivity=pl/A

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Askiitians Expert

Sagar Singh

B.Tech, IIT Delhi

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