Question

ДАю 50 баллов СРОЧНО!! Длина одного провода 20 см, второго – 5 м. Площадь поперечного сечения и материал проводов одинаковы. У какого провода сопротивление больше и во сколько раз? Первого, в 25 раз Второго, в 25 раз Первого, в 5 раз Второго, в 2 раза

Answer 1

Ответ:

по формуле R=(r•l)/s, так как сказано что площади и материал одинаковые, то все зависит только от длины l,значит сопротивление второго больше в 5:0,2=25 раз

Answer 2

Calculation of Resistance

To determine which wire has a greater resistance and by how much, we need to consider the length and cross-sectional area of the wires.

Let's denote the resistance of the first wire as R1 and the resistance of the second wire as R2.

Given: - Length of the first wire = 20 cm = 0.2 m - Length of the second wire = 5 m - The cross-sectional area and material of the wires are the same.

The resistance of a wire can be calculated using the formula:

Resistance = (Resistivity * Length) / Cross-sectional Area

Since the cross-sectional area and material of the wires are the same, the resistivity is constant for both wires.

Therefore, we can compare the resistances of the two wires by comparing their lengths.

Comparing the Resistances

To compare the resistances, we need to calculate the resistance of each wire using the given lengths.

1. First Wire: - Length = 0.2 m - Cross-sectional area = Same as the second wire - Resistance = (Resistivity * Length) / Cross-sectional Area

2. Second Wire: - Length = 5 m - Cross-sectional area = Same as the first wire - Resistance = (Resistivity * Length) / Cross-sectional Area

Now, let's calculate the resistances of the two wires.

Calculation

1. First Wire: - Length = 0.2 m - Resistance = (Resistivity * Length) / Cross-sectional Area

2. Second Wire: - Length = 5 m - Resistance = (Resistivity * Length) / Cross-sectional Area

Since the cross-sectional area and material of the wires are the same, we can compare the resistances by comparing their lengths.

Answer

The resistance of the first wire is greater than the resistance of the second wire.

The resistance of the first wire is 25 times greater than the resistance of the second wire.

Please note that the exact values of resistivity and cross-sectional area are not provided in the question, so we cannot calculate the exact resistance values. However, based on the given information, we can conclude that the resistance of the first wire is greater than the resistance of the second wire by a factor of 25.

I hope this helps! Let me know if you have any further questions.