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
Answer:
See explanation and image attached
Explanation:
A poly atomic ion refers to an ion that has more than one atom. The nitrate ion is one of such! It contains three oxygen atoms and one nitrogen atom.
It is an ion in which there is charge separation as shown in the image attached to this answer. The structures shown are the Lewis structure of the nitrate ion that satisfy the octet rule.
