Magnetic field ppt

1. VARIATION OF MAGNETIC FIELD
IN A CIRCULAR COIL

2. WHAT IS A MAGNETIC FIELD
• A magnetic field is the physical phenomenon produced by
moving electric charges and exhibited by ferrous materials.
• A magnetic field is a vector field that describes the magnetic
influence of electric charges in relative motion and magnetized
materials. Magnetic fields are observed in a wide range of size
scales, from subatomic particles to galaxies.
This Photo by Unknown Author is licensed under CC BY

3. WHAT IS A MAGNETIC COIL?
• An electromagnetic coil is an electrical conductor such as a wire in the shape of a
coil, spiral or helix.
• Electromagnetic coils are used in electrical engineering, in applications where
electric currents interact with magnetic fields, in devices such as electric motors,
generators, electromagnets, transformers, . Either an electric current is passed
through the wire of the coil to generate a magnetic field, or conversely an external
time-varying magnetic field through the interior of the coil generates an EMF
(voltage) in the conductor.
• A current through any conductor creates a circular magnetic field around the
conductor due to Ampere's law.
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4. MAIN THINGS TO REMEMBER:
To study the variation of magnetic field in a circular coil. we
should now about the tangent law and also the direction and
magnitude of the magnetic field around the coil.
Tangent law: it is a way to compare the strengths of two magnets
fields that are perpendicular to each other.

5. THINGS I HAVE STUDIED:
• The intensity of magnetic field is maximum at the center
• And it goes on decreasing as we move away from the center of
the coil toward right or left
• The distance between the two points of inflexion is equal to the
radius of coil is equal to the radius of the circle.

6. • We will get a graph between tan angle and x where the tan
angle is the deflection produced in a deflection magnetometer
and x is the distance from the center of the coil.
• The curve is first concave towards o and then afterwards
become convex.
• The points where the curve changes its nature is called the
points of inflection

7. THE GRAPH