Question

What will be effect on the resistivity of a conductor, if the length of the conductor is made

four times?
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Answer 1

Answer:

here is ur answer

Explanation:

The length is 4 times original, so resistance is t times greater.

Area is 4 times less, so resistance is 4 times greater, ie x16 in total.

However. Electrons are all negative and repel each other so more current travels over the surface than through the core. The surface area is reduced and the resistance is again increased. This effect is greatest at high voltage when there are more electrons around. This is why pylon cables are made of steel, for strength, and coated with aluminium for surfaces conductivity.

Also because the wire is thinner, the current per unit area is increased (by a factor of 4) so the wire will heat up more, again increasing the resistence.

In total, resistance for negibable current at negligible voltage is increased by a factor of 16. Higher current and voltage will adversely affect the resistance

Answer 2

Answer:

Yes four times

Explanation:

$R = p\frac{l}{A}$

If length is 4 times then respectively Resistance will also increase by 4 times.

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