Physics, 11.03.2020 04:06 Bassoonist

A 8.10cm diameter wire coil is initially oriented so that its plane is perpendicular to a magnetic field of 0.710T pointing up. During the course of 0.120s, the field is changed to one of 0.240T pointing down. What is the average induced emf in the coil?

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Answer from: portielesc

The average induced emf in the coil is 20.19 mV

Explanation:

Given;

diameter of wire, d = 8.10cm = 0.081 m

initial magnetic field strength, B₁ = 0.71 T

final magnetic field strength , B₂= 0.24 T

time = 0.12 s

According to Faraday's law, average induced emf in the coil is directly proportional to the rate of change of flux.

$E.M.F= \frac{\delta \phi}{dt} = \frac{BA}{t}$

where;

A is the area of the wire = ¹/₄ (πd²)

= ¹/₄ (π x 0.081²) = 0.005154 m²

$E.M.F = \frac{(0.71-0.24)*0.0053}{0.12} =0.02019 \ V = \ 20.19 \ mV$

Therefore, the average induced emf in the coil is 20.19 mV

Answer from: Quest

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Answer from: Quest

answer;

d. are made mostly of liquid

explanation;

-the general composition and structure planets includes; they have a thick gas and liquid layer covering a small,solid core. mostly the gases are hydrogen and helium atmosphere and layers of liquid hydrogen. for instance neptune and uranus are examples of the outer planets, they have a core covered by ice and ammonia.

-neptune's atmosphere is hydrogen and helium with a bit of methane so there is no oxygen to breath and the interior is made up of frozen water and ammonia with a rock and iron core. thus, there is no liquid water or solid surface to survive.

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