Search 75,962 tutors
Ask a question
0 0

## 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?

# Comments

Spin the magnet
Tutors, please sign in to answer this question.

# 2 Answers

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.

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.

Cheers,
Mike