Question

A cube made of a conducting material of side length 15 cm is
reshaped to be a wire of electric resistance 45 ohm , if the resistivity of
the material of the cube is 1.6x10-7 ohm.m.
Calculate the length of the wire

Answer 1

Answer:

Explanation:

The wire is in the shape of rectangle

length = 18 cm

breadth = 15 cm

now the wire is bent into a circle

so

perimeter of rectangle = circumference of the circle

2(l+b) = 2πr

2(18 +15)     =  2πr

2×33 = 2πr

66 = 2πr

66 × 7/ 2×22 = r

33 × 7/22 =r

21/2  = r

10.5 = r

so the radius of the circle is 10.5 cm

Answer 2

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Explanation:

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