Which metal is liquid at room temperature?
2 answers:
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Answer:
The answer is below
Explanation:
The resistance of a conductor (R) is given by:
and ρ is resistivity
The length = 20cm = 0.2 m
The tube has an outer diameter of 1.1 cm (0.011 m), hence the outer area is:
A₁ = π * diameter²/4 = π * 1.1²/4 = 0.000095 m²
The tube has an inner diameter of 0.85 cm (0.0085 m), hence the inner area is:
A₂ = π * diameter²/4 = π * 0.0085²/4 = 0.0000567 m²
The conductor area = outer area - inner area = 0.000095 m² - 0.0000567 m² = 0.0000383 m²
Hence, the resistance is:
To solve the problem it is necessary to use the concepts and expressions related to the magnetic dipole moment.
It is usually defined by,
Where,
Magnetic Dipole Moment
I = Current
A = Area
In this way re-arrange for the current and replacing,
Therefore the current is Amperes