Substance Specific Heat (1 kg"K"
2 answers:
Aluminium has the highest amount of specific heat, so the engineer should consider Aluminium to absorb the most heat generated by the motor.
Explanation:
The capacity of heat absorbed by any metal can be calculated using the formulation of product of its specific heat with the mass and change in temperature.
So as the absorption capacity of any metal is directly proportional to the specific heat of the metal. The more the specific heat of the metal, the more amount of heat it can absorb. As specific heat is the amount of heat energy required to raise the temperature of an object by 1°C. So the greater the specific heat, the greater amount of heat energy will be absorbed by that metal.
Among the given options, aluminium has the highest amount of specific heat, so the engineer should consider Aluminium to absorb the most heat generated by the motor.
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Answer:
(a) B = 2.85 × Tesla
(b) I = I = 0.285 A
Explanation:
a. The strength of magnetic field, B, in a solenoid is determined by;
r =
⇒ B =
Where: r is the radius, m is the mass of the electron, v is its velocity, q is the charge on the electron and B is the magnetic field
B =
=
B = 2.85 × Tesla
b. Given that; N/L = 25 turns per centimetre, then the current, I, can be determined by;
B = μ I N/L
⇒ I = B ÷ μN/L
where B is the magnetic field, μ is the permeability of free space = 4.0 ×Tm/A, N/L is the number of turns per length.
I = B ÷ μN/L
=
I = 0.285 A