Electric field creates a 3.9 ma current in a 1.0-mm-diameter wire. what material is the wire made of?
2 answers:
The wire made of Nichrome
<h3><em>Further explanation </em></h3>
The ρ resistivity of an object is the ratio of the magnitude of the electric field to the current density
Can be formulated:
Current density (J) itself is the ratio of currents per unit area of cross-section
Can be formulated:
Complete questions from the assignments above can be stated as follows:
A 0.0075 V / m electric field creates a 3.9 mA current in a 1.0 mm diameter wire. What is the wire made of?
a) Aluminum (resistivity: 2.82 * 10 ^ -8)
b) Nichrome (resistivity: 1.1 * 10 ^ -6)
c) Copper (resistivity: 1.68 * 10 ^ -8)
d) Iron (resistivity: 1.0 * 10 ^ -7)
If we see the question above then to find the resistivity of the material we must find the wire cross-section area first
Known value
E = 0.0075 V / m
I = 3.9 mA = 3.9.10⁻³ A
d = 1.0 mm = 1.10⁻³ m
A = 1 / 4 π.d²
A = 1 / 4. π. (10⁻³)²
A = 1/4 . π . 10⁻⁶
so that
ρ = 1.5.10⁻⁶ ohm . m
From this value the material which approaches its resistivity is Nichrome with resistivity: 1.1 . 10⁻⁶ ohm.m
<h3><em>Learn more </em></h3>
the flow of electric current.
Electric current
The direction of the magnetic field
An electric current produces a magnetic field.
the direction of the electric field
Keywords: the magnetic field, electric current, resistivity , Nichrome
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Answer:
Density = 0.0007667 Kg/cm³
Explanation:
Given the following data;
Mass of empty beaker = 0.50 kg
Volume of solution = 300 cm³
Mass of glass+solution = 730 g
To find the density of the solution in the glass;
First of all, we would convert the value in grams to kilograms.
Conversion:
1000 grams = 1 kg
730 = X kg
Cross-multiplying, we have;
X = 730/1000 = 0.73 kg
Next, we would determine the mass of the solution.
Mass of solution = Mass of glass+solution - Mass of empty beaker
Mass of solution = 0.73 - 0.50
Mass of solution = 0.23 kg
Lastly, we would solve for the density of the solution;
Density can be defined as mass all over the volume of an object.
Simply stated, density is mass per unit volume of an object.
Mathematically, density is given by the formula;
Substituting into the formula, we have;
Density = 0.0007667 Kg/cm³