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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?

Spin the magnet

### 2 Answers by Expert Tutors

Richard P. | Fairfax County Tutor for HS Math and ScienceFairfax County Tutor for HS Math and Sci...
4.9 4.9 (639 lesson ratings) (639)
1
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
1
What 's up L from Jacksonville.

First answer...TRUE.  This is called Ferromagnetism

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.

Cheers,
Mike