Right Hand Grip Rule
Fingers: direction of current
Thumb: North pole
Or
Fingers: direction of magnetic field
Thumb: direction of current flow
Thumb: North pole
Or
Fingers: direction of magnetic field
Thumb: direction of current flow
Fleming's Left Hand Rule
Thumb: direction of induced force
Index finger: direction of magnetic field
Middle finger: direction of current
When to use:
A current inducing a force (example: D.C. motor)
Index finger: direction of magnetic field
Middle finger: direction of current
When to use:
A current inducing a force (example: D.C. motor)
Fleming's Right Hand Rule
Thumb: direction of force
Index finger: direction of magnetic field
Middle finger: direction of induced current
When to use:
A force inducing a current (example: A.C. generator)
Index finger: direction of magnetic field
Middle finger: direction of induced current
When to use:
A force inducing a current (example: A.C. generator)
Lenz's Law
The magnetic field of an induced current is such that its effect opposes the direction of the magnet's movement.
In simple English:
If a magnet is moving INTO a solenoid, the induced current will have a magnetic field that acts to push the magnet AWAY from the solenoid.
In simple English:
If a magnet is moving INTO a solenoid, the induced current will have a magnetic field that acts to push the magnet AWAY from the solenoid.
Faraday's Law
The magnitude of an induced current is proportional to the rate of change of magnetic flux.
In simple English:
The faster the wire cuts the magnetic field lines, the stronger the current induced.
In simple English:
The faster the wire cuts the magnetic field lines, the stronger the current induced.