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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Correct Answer is : 54 131Xe
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.................................................................................................................
Correct Answer is : 54 131Xe
Reason:
Emission of beta particle from radioactive material increases atomic number by one, but atomic mass number donot change.
In present case, the reactant is 53 131 I. When, iodine emits beta particle i.e. electron, it atomic number increases by one. Hence, it gets converted into Xe. Atomic number of Xenon is 54.