What happens if you move a magnet near a coil of wire? A. Current is induced. B. Power is consumed. C. The coil becomes magnetiz
2 answers:
Answer:
If you move a magnet near a coil of wire then the current is induced.
Option A is correct.
Explanation:
According to Faraday's law of induction
If we move a magnet near a coil of wire then an emf (electromotive force) is induced in the wire which produces current in it. The induced emf is linked to the rate of change of the magnetic flux linked with the coil.
The induced emf is given by:
Where, = magnetic flux
Where, B = magnetic field
A = area of coil
N = number of turns
Hence, If you move a magnet near a coil of wire then the current is induced.
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<h2>Answer: 0.17</h2>
Explanation:
The Stefan-Boltzmann law establishes that a black body (an ideal body that absorbs or emits all the radiation that incides on it) "emits thermal radiation with a total hemispheric emissive power proportional to the fourth power of its temperature":
(1)
Where:
is the energy radiated by a blackbody radiator per second, per unit area (in Watts). Knowing
is the Stefan-Boltzmann's constant.
is the Surface area of the body
is the effective temperature of the body (its surface absolute temperature) in Kelvin.
However, there is no ideal black body (ideal radiator) although the radiation of stars like our Sun is quite close. So, in the case of this body, we will use the Stefan-Boltzmann law for real radiator bodies:
(2)
Where is the body's emissivity
(the value we want to find)
Isolating from (2):
(3)
Solving:
(4)
Finally:
(5) This is the body's emissivity
Answer:
8 seconds
Explanation:
power (P) is defined as the rate at which work is done.
power is measured in Watts (W) , when the work done is measured in Joules (J) and time in seconds
by the definition of power,