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Q.

Two fuse wires are made of the same material the radius of first and second wires are  r1 = 2 mm and  r2 = 4 mm . The first wire blows when a current of 15 A passes through it. Find the current require to blow the second wire

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a

302

b

152

c

303

d

163

answer is A.

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Detailed Solution

For a fuse wire of given material i2 α  r3 ⇒i2i1 =r2r13/2 ⇒i215 =423/2=22 ⇒i2=302 A
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Two fuse wires are made of the same material the radius of first and second wires are  r1 = 2 mm and  r2 = 4 mm . The first wire blows when a current of 15 A passes through it. Find the current require to blow the second wire