Since the outer plumage of the penguin can resist the flow of heat in the cold antarctic air they might gain a little of this heat to keep them warm by thermal convection.
<u>Explanation:</u>
- Convection is the circular movement that happens when hot air/liquid moves with molecules that were fast, making it less dense rises while the cold air/liquid drops down.
- Also, they follow the technique of standing together always in a group which further helps them to decrease the loss of heat between them.
- The plumage of penguin provides 80 percent of total insulation and is highly resistant to wind penetration.
The Correct choice is ~
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Answer
given,
number of turns, N = 400 turns
mean radius, R = 6 cm
Current, I = 0.25 A
relative permeability, K_m = 80
a) Magnetic field in the core
B = 2.67 x 10⁻² T
b) the amount of magnetic field due to atomic current
B = 2.63 x 10⁻² T
The attractions between the particles in a liquid are strong enough to keep the particles close together. Without any significant attractions between particles in a gas, the particles are free to expand into any volume that is available
