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Activity 8: Magnetic Field Around Current-carrying Conductors
Terms in this set (14)
With conventional current moving up to the vertical wire,
the north pole of the compass needle points counterclockwise about the wire.
With conventional current moving down the vertical wire, (with the current's polarity reversed)
the north pole of the compass needle points clockwise about the wire.
The right-hand rule for conventional current (from positive to negative): Grasp the straight or looped conductor such that the right thumb points in the
direction of conventional current.
The right-hand rule for conventional current (from positive to negative): The other fingers point or curl in the
direction of the induced magnetic field.
Using the right-hand rule, the direction of the magnetic field follows the direction of the right hand fingers when the right thumb points in the direction of the
Using the left-hand rule, the direction of the magnetic field follows the direction of the left hand fingers when the left thumb points in the direction of the
real flow of current (from negative to positive).
flows from the negative to positive.
flows from the positive to negative.
A decrease in the number of loops in the coil,
means a shorter wire and a weaker magnetic field, causing less noticeable, compass needle deflections.
The magnetic field is directly proportional to the
number of turns/loops in a coil.
refers specifically to a long, thin loop of wire wrapped around a metallic core, which produces a uniform magnetic field in a volume of space when an electric current is passed through it.
What would be the direction of the magnetic field around the current-carrying solenoid when the switch is closed?
With the current flowing counterclockwise from the positive end to the negative end, the magnetic field around the current-carrying coil enters the positive end of the coil and leaves the negative end.
Direction of Conventional Current
Direction of Induced Magnetic Field