A wire of length 100cm and cross-sectional area 2.0*10-3cm2 has a resistance of 0.1 ohms.

calculate it's electrical conductivity? 

To calculate the electrical conductivity of the wire, we can use the equation:

Electrical conductivity (σ) = 1 / (Resistance × Cross-sectional Area)

Given:

Length of the wire (L) = 100 cm
Cross-sectional Area (A) = 2.0 * 10^-3 cm^2
Resistance (R) = 0.1 ohms

Substituting the values:

σ = 1 / (0.1 * 2.0 * 10^-3)

Simplifying:

σ = 1 / (2.0 * 10^-4)

σ = 5000 S/cm (Siemens per centimeter)

Therefore, the electrical conductivity of the wire is 5000 S/cm.

To calculate the electrical conductivity of a wire, you need the formula:

Conductivity (σ) = (1 / Resistivity)

Since the wire's resistance (R) is given as 0.1 ohms, we can calculate the resistivity (ρ) using the formula:

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

Given:
Resistance (R) = 0.1 ohms
Cross-sectional Area (A) = 2.0 * 10^-3 cm^2
Length (L) = 100 cm

First, we need to convert the cross-sectional area from cm^2 to m^2.
1 cm^2 = 10^-4 m^2

Cross-sectional Area (A) = 2.0 * 10^-3 cm^2 * (10^-4 m^2 / 1 cm^2)
Cross-sectional Area (A) = 2.0 * 10^-7 m^2

Now we can substitute the values into the formula for resistivity:

Resistivity (ρ) = (Resistance * Cross-sectional Area) / Length
Resistivity (ρ) = (0.1 ohms * 2.0 * 10^-7 m^2) / 100 cm

Next, convert the length from cm to meters:
1 cm = 10^-2 m
Length (L) = 100 cm * (10^-2 m / 1 cm)
Length (L) = 1 meter

Now substitute the values for resistivity into the equation:

Resistivity (ρ) = (0.1 ohms * 2.0 * 10^-7 m^2) / 1 meter
Resistivity (ρ) = 2.0 * 10^-8 ohm-meter

Finally, substitute the resistivity value into the formula for electrical conductivity:

Conductivity (σ) = (1 / Resistivity)
Conductivity (σ) = 1 / (2.0 * 10^-8 ohm-meter)
Conductivity (σ) = 5.0 * 10^7 (ohm-meter)^-1

Therefore, the electrical conductivity of the wire is 5.0 * 10^7 (ohm-meter)^-1.

Given:

L = 100 cm = 1.0 m.
A = 2.0*10^-3 cm^2 = 2.0*10^-7 m^2.

R = P*L/A.
0.1 = P*1.0/2*!0*-7,
P = 2*10^-8 Ohm-meters.