A tightly coiled spring having 75 coils, each 3.50 cm in diameter, is made of insulated metal wire 3.25 mm in diameter. An ohm meter connected across its opposite ends reads 1.74 Ω. What is the resistivity of the metal?
Solution:
Given,
number of turns,
diamter of spring,
radius of spring,
diameter of metal wire,
radius of metal wire,
resistance of metal wire,
resistivity of metal wire,
Let,
Detailed explanation of this numerical problem can be found in the video below. ( Skip to 11:08 ).
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