(b) Explain how does the resistance of a wire vary with its length.
(c) The tungsten is used almost exclusively for filament of electric lamp. Comment
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resistance is directly proportional to the length...it increases when length increases...tungsten is used because of it's heating effect...it glows when it gets heated
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1. or (b) - First, the total length of the wires will affect the amount of resistance. The longer the wire, the more resistance that there will be. ... After all, if resistance occurs as the result of collisions between charge carriers and the atoms of the wire, then there is likely to be more collisions in a longer wire.
2. or (c) - Tungsten metal is used exclusively for making the filament of electric bulbs because it has a very high melting point. Due to its high melting point, the tungsten filament can be kept white hot without melting away.
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