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Last Updated On 01-06-2023 - By Jeesha Sara

A fuse wire with a radius of 1 mm blows at 1.5 A. If the fuse wire of the same material should blow at 3.0 A, the radius of the fuse wire must be

a)

 mm

b)

mm

c)

0.5 mm

d)

8.0 mm


Question ID - 150232 :-

A fuse wire with a radius of 1 mm blows at 1.5 A. If the fuse wire of the same material should blow at 3.0 A, the radius of the fuse wire must be

a)

 mm

b)

mm

c)

0.5 mm

d)

8.0 mm

1 Answer
5876 Votes
3537

Answer Key : (a) -

(a)

The temperature of the wire increases to such a value at which, the heat produced per second equals heat lost per second due to radiation ,

, where  is heat lost per second per unit area due to radiation.

Hence,

So

 mm.



Next Question :

 of current is passed through a metallic conductor. The charge flowing in one minute in coulomb will be

a)

5

b)

12

c)

1/12

d)

300


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