Answer: See photo
Explanation: There are a couple of ways to use velocity in an equation in the photo.
B)Magnetized
Electrons can behave as tiny magnets, each with north (N) and south (S)
poles. When an atom's electrons are lined up in the same orientation,
with most having their N pole facing one direction, the atom becomes
like a magnet, with N and S poles. It is also possible for the electrons
to be in various directions, making the atom not magnetic.
You can find the emf of the battery by using:
Q = CV.
Q = Charge in capacitor plates = 30μC
C = Capacitance of the capacitor = 30μF
V = Q/C = 30/30 = 1V
Ans: The emf of the battery = 1V.
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