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The sum of an object's potential and kinetic energies is called the object's mechanical energy. As an object falls its potential energy decreases, while its kinetic energy increases. The decrease in potential energy is exactly equal to the increase in kinetic energy.
Explanation:
Given that,
Radius = 10.5 cm
Magnetic field = 0.117 T
Time = 0.243 s
After stretched, area is zero
(I). We need to calculate the magnetic flux through the loop before stretched
Using formula of magnetic flux


Where, B = magnetic field
r = radius
Put the value into the formula


(II). We need to calculate the magnetic flux through the loop after stretched

Here, A = 0

So, The magnetic flux through the loop after stretched is zero.
(III). We need to calculate the magnitude of the average induced electromotive force
Using formula of the induced electromotive force




Hence, This is the required solution.
Those that take the electron from the highest orbital to the lowest (n=1) at this point the energy is -13.6eV. The wavelength is given by c/f. So a large energy (E=hf) gives a short wavelength. Falling from a farther distance out down to the nucleus releases the most energy