Two wires are of same length and radius but one of them is copper and the other is of iron. Which will have more resistance? (Given the resistivity of copper = 1.62 x 10 -8 ohm meter and resistivity of iron = 10 x 10-8 ohm meter.)
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Answered by
124
Resistivity is defined as an inherant property of a material that indicates how easily electric current can flow through it or how large the flow of current is resisted by the material.
Calculation of resistance is as follows:
Resistance(R)= resistivity x Length/ Area
Therefore if area and the length of the two wires is the same, from both the definition of resistivity and the calculation of resistance, we can see that in this situation, the resulting resistance will be determined by the amount of the resistivity.
Therefore the greater the resistivity, the more the resistance is and the smaller the resistivity, the lesser the resistance.
Hence, Iron will have more resistance since it has more resistivity while the copper will have a smaller resistance than iron due to its smaller resistivity.
Calculation of resistance is as follows:
Resistance(R)= resistivity x Length/ Area
Therefore if area and the length of the two wires is the same, from both the definition of resistivity and the calculation of resistance, we can see that in this situation, the resulting resistance will be determined by the amount of the resistivity.
Therefore the greater the resistivity, the more the resistance is and the smaller the resistivity, the lesser the resistance.
Hence, Iron will have more resistance since it has more resistivity while the copper will have a smaller resistance than iron due to its smaller resistivity.
Answered by
3
Answer:
Explanation:
We know that
Resistance(R) = ρ * (L/A)
So, the more the resistivity, more the resistance.(If length and area of cross-section remain the same)
Thus, Iron has a higher resistance.
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