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LENZ’S LAW
Heinrich F.E. Lenz
•   Russian physicist
•   (1804-1865)
•   1834 Lenz’s Law
•   There is an induced current
    in a closed conducting loop
    if and only if the magnetic
    flux through the loop is
    changing. The direction of
    the induced current is such
    that the induced magnetic
    field always opposes the
    change in the flux.
There is an induced current in a closed conducting loop if and only if
the magnetic flux through the loop is changing. The direction of the
induced current is such that the induced magnetic field always opposes
the change in the flux.
Right Hand Rule
•   If you wrap your
    fingers around the
    coil in the direction
    of the current, your
    thumb points
    north.
If the field of the bar magnet is already in the loop and the
magnet is removed, the induced current is in the direction that
tries to keep the field constant
2    Direction of induced current
    b    Lenz's law
                          In both cases, magnet
                          moves against a
                          force.
                          Work is done during
                          the motion & it is
                          transferred as electrical
                          energy.

    Induced I always flows to oppose the
    movement which started it.
Example 1
    Current induced along a coil

A bar magnet passes through a coil:




   (i)                             (ii)     (iii)



(a) Indicate the direction of the induced I in
    each case. Explain briefly.
Example 1
    Current induced along a coil
(a) Indicate the direction of the induced I. Explain.
S                 N


                   When magnet’s N-pole is moving
I                  into coil,
    (i)            induced I flows in such a direction as
                   to produce a N-pole
Lenz’
s law              to oppose the approaching of magnet.
Example 1
   Current induced along a coil
(a) Indicate the direction of the induced I. Explain.




                                  (ii)



          The induced I become zero
            I is about to change direction.
           ∴
Example 1
   Current induced along a coil

(a) Indicate the direction of the induced I. Explain.
                      N              S


                       I

                             (iii)


   When magnet’s S-pole is leaving the coil,
   induced I flows in such a direction as to
   produce a N-pole to oppose the leaving of
   magnet.
Lenz’s Law
             •   Alternating current
                 through the coil
             •   What happens to Iron
                 core?
             •   What will happen to
                 the ring?
Lenz’s Law
             •   The changing magnetic
                 field in the coil due to the
                 change in current induces
                 a current in the metal ring.
                  Lenz’s Law states that the
                 magnetic field in the ring
                 opposes the magnetic field
                 of the coil and forces the
                 ring to fly away.
Lenz’s Law
             •   What just happened?
             •   How often does this
                 occur?
Applications of Magnetic Induction
•   Magnetic Levitation (Maglev) Trains
    •   Induced surface (“eddy”) currents produce field in
        opposite direction
         Repels magnet
         Levitates train
              S
                N
                           rails
          “eddy” current




    •   Maglev trains today can travel up to 310 mph
           Twice the speed of Amtrak’s fastest conventional
        train!
liner induction

     0-70 mph in 3 sec
liner induction
FALLING MAGNET
          •   the copper tube "sees" a
              changing magnetic field
              from the falling magnet.
              This changing magnetic
              field induces a current in
              the copper tube.
          •   The induced current in
              the copper tube creates
              its own magnetic field
              that opposes the
              magnetic field that
              created it.

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Powerpoint presentation about lenz's law

  • 2. Heinrich F.E. Lenz • Russian physicist • (1804-1865) • 1834 Lenz’s Law • There is an induced current in a closed conducting loop if and only if the magnetic flux through the loop is changing. The direction of the induced current is such that the induced magnetic field always opposes the change in the flux.
  • 3. There is an induced current in a closed conducting loop if and only if the magnetic flux through the loop is changing. The direction of the induced current is such that the induced magnetic field always opposes the change in the flux.
  • 4. Right Hand Rule • If you wrap your fingers around the coil in the direction of the current, your thumb points north.
  • 5. If the field of the bar magnet is already in the loop and the magnet is removed, the induced current is in the direction that tries to keep the field constant
  • 6. 2 Direction of induced current b Lenz's law In both cases, magnet moves against a force. Work is done during the motion & it is transferred as electrical energy. Induced I always flows to oppose the movement which started it.
  • 7. Example 1 Current induced along a coil A bar magnet passes through a coil: (i) (ii) (iii) (a) Indicate the direction of the induced I in each case. Explain briefly.
  • 8. Example 1 Current induced along a coil (a) Indicate the direction of the induced I. Explain. S N When magnet’s N-pole is moving I into coil, (i) induced I flows in such a direction as to produce a N-pole Lenz’ s law to oppose the approaching of magnet.
  • 9. Example 1 Current induced along a coil (a) Indicate the direction of the induced I. Explain. (ii) The induced I become zero I is about to change direction. ∴
  • 10. Example 1 Current induced along a coil (a) Indicate the direction of the induced I. Explain. N S I (iii) When magnet’s S-pole is leaving the coil, induced I flows in such a direction as to produce a N-pole to oppose the leaving of magnet.
  • 11. Lenz’s Law • Alternating current through the coil • What happens to Iron core? • What will happen to the ring?
  • 12. Lenz’s Law • The changing magnetic field in the coil due to the change in current induces a current in the metal ring. Lenz’s Law states that the magnetic field in the ring opposes the magnetic field of the coil and forces the ring to fly away.
  • 13. Lenz’s Law • What just happened? • How often does this occur?
  • 14. Applications of Magnetic Induction • Magnetic Levitation (Maglev) Trains • Induced surface (“eddy”) currents produce field in opposite direction  Repels magnet  Levitates train S N rails “eddy” current • Maglev trains today can travel up to 310 mph  Twice the speed of Amtrak’s fastest conventional train!
  • 15. liner induction 0-70 mph in 3 sec
  • 17. FALLING MAGNET • the copper tube "sees" a changing magnetic field from the falling magnet. This changing magnetic field induces a current in the copper tube. • The induced current in the copper tube creates its own magnetic field that opposes the magnetic field that created it.