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help with voltage and electricity c/o physical science

true or false      iron is easily magnetized because it has pairs of electrons which gspin in the same direction
i think this is true
true or false      voltage can be induced in a wire coal by moving the wire coal through a magnetic field
i think this is true
if there were no current in the wire running through the magnet, what could  you do to induce an electric current?


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Richard P. | Fairfax County Tutor for HS Math and ScienceFairfax County Tutor for HS Math and Sci...
4.9 4.9 (617 lesson ratings) (617)
The first statement is essentially true.   The conduction band electrons in single domain of iron do have parallel spins.  Since the electron has a magnetic moment, a magnetic field results.
The second is almost true. A voltage will be induced in a wire coil moving in a non-uniform magnetic  field.  Alternatively, a coil in uniform magnetic field can be rotated on a transverse axis to induce a voltage.
I am not sure how to interpret the third one.   If the wire mentioned is a coil wound around the magnet, A current could be induced by withdrawing the magnet from the coil.
Michael A. | Math/Physics/Science TutorMath/Physics/Science Tutor
What 's up L from Jacksonville.
First answer...TRUE.  This is called Ferromagnetism
next answer...TRUE, but why?  See "Faraday's Law."
last answer...You can induce a current using Faraday's Law.  Consider the second question.  If I move a coil through a magnetic field (or vice versa), this induces a voltage.
Ohm's law says that voltage = current x resistance.  So, induced voltage will create an induced current.