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Arada [10]
3 years ago
8

Which change decreases the resistance of a piece

Physics
1 answer:
nika2105 [10]3 years ago
8 0

Explanation :

We know that the resistance of the wire is given by :

R=\rho \dfrac{l}{A}

Where

\rho is the resistivity

l is the length of the wire

A is the area of the wire.

Another factor on which the resistance of wire depends is temperature. It is given by :

R=R_{ref}[1+\alpha (T-T_{ref})]

So, it is clear that the resistance of the wire is directly proportional to the temperature. It we want to decrease the resistance of the piece, its temperature should be decreased.

So, the correct option is (3) " decreasing the wire’s temperature ".

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