Chapter 16_flip

Chapter 16: Magnetic Fields (Every definitions)



1. Magnetic Field


-Magnetic field is a field of force produced by current-carrying
conductors or by permanent magnets



2. Fleming’s Left-Hand rule


- Fleming’s left-hand rule states that if the thumb,first finger and second
-Magnetic field is defined as a field of force produced by current-
finger of the left hand are stretched at right angles to each other, with first
carrying conductor or by permanent magnets
finger pointing in the direction of magnetic field,B,second finger in direction
of velocity,V of positive charge then thumb points in the direction of force,F




















3. Magnetic flux density/Magnetic field strength

-Magnetic flux density of a magnetic field is the force on a charge of one

coulomb moving with a velocity of 1 −1 at right angles to the magnetic field
F
B =
qv sinθ
-the number of lines of force passing through a unit area of material

4. Fleming’s right hand grip rule/ Right-hand rule


-If the wire is grasped in the right hand with the thumb in the direction of the
current, then the fingers curl in the direction of magnetic field

5. Ampere’s law

-Ampere’s law states that for any closed path,the sum of the length elements

∆I times, the magnetic field parallel to the lengths element equals ɥ


where I is the current enclosed by the closed path
6. Fleming’s right-hand rule

-shows the direction of induced current when a conductor attached to a circuit
moves in a magnetic field
-The right hand is held with the thumb, index finger and middle
finger mutually perpendicular to each other

-The thumb is pointed in the direction of the motion of the conductor relative
to the magnetic field.

-The first finger is pointed in the direction of the magnetic field. By
convention, it's the direction from North to South magnetic pole.


-Then the second finger represents the direction of the induced or
generated current within the conductor

















7. Hall effect

-Hall effect is the phenomenon in which a transverse voltage is set

up in a conductor carrying a current in a magnetic field. The voltage
set up is known as the Hall voltage.