Question

Помогите пожалуйста !Реостат сопротивлением 21 Ом изготовлен из никелиновой проволки. Какова длинна проволки, если площадь ее поперечного сечения 0,5 мм в квадрате?

Answer 1

L=RS/р

L=(21*0,5)/0,4=26,25м

Answer 2

Calculation of the Length of the Nickel Wire

To calculate the length of the nickel wire, we need to use the formula for resistance:

Resistance (R) = Resistivity (ρ) x Length (L) / Cross-sectional Area (A)

Given: - Resistance (R) = 21 Ω - Cross-sectional Area (A) = 0.5 mm²

We need to find the length of the wire (L).

To solve for L, we rearrange the formula as follows:

L = (R x A) / ρ

However, we don't have the resistivity (ρ) of the nickel wire. Without the resistivity value, it is not possible to calculate the length of the wire accurately.

Unfortunately, the provided search snippets do not contain the necessary information to determine the resistivity of nickel wire. Therefore, we cannot proceed with the calculation at this time.

If you have any other questions or need further assistance, feel free to ask!