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In the context of electromagnetism, the magnetic polarity of a coil of several turns can be determined by the ______.
right-hand rule
molecular theory
left-hand rule
mechanism of force production
right-hand rule
The magnetic polarity of a current-carrying coil is determined using the Right-Hand Grip Rule. When the fingers of the right hand are curled in the direction of the current flowing through the turns of the coil, the extended thumb points in the direction of the North magnetic pole.
The magnetic polarity of a current-carrying coil is determined using the Right-Hand Grip Rule. When the fingers of the right hand are curled in the direction of the current flowing through the turns of the coil, the extended thumb points in the direction of the North magnetic pole.
B=L╬╝0тАЛNIтАЛ тАФ magnitude of magnetic field inside a solenoid
╬ж=тИлBтЛЕdA тАФ magnetic flux linked with the coil
This principle relies on the relationship between current flow (charge in motion) and the induced magnetic field lines. As current flows through each turn of a coil, it generates concentric magnetic field lines that align and reinforce each other within the core of the coil, creating a north and south pole at the ends based on the orientation of the curl.
The Right-Hand Grip Rule is specific to coils and solenoids.
The thumb indicates the North pole direction.
Reversing the current direction swaps the magnetic poles.
The rule applies regardless of whether the coil is air-cored or magnetic-cored.
Provides a simple visual method for quick polarity identification.
Consistent across all electromagnetic induction applications.
Requires knowledge of conventional current direction.
Can be confusing if applied using the left hand by mistake.
Design of electromagnetic relays.
Identification of poles in electric motors and generators.
Transformer winding polarity checks.
The molecular theory relates to how materials are magnetized internally but does not identify external coil polarity.
The left-hand rule is typically used for force on a current-carrying conductor (Fleming's Left-Hand Rule), not for coil polarity.
Ensure you always use the right hand to avoid polarity inversion errors in exams.
A is correct тАФ The right-hand rule is the standard method for determining the magnetic polarity of a coil based on the direction of current flow.
Always differentiate between Fleming's Left-Hand Rule (for force on a motor conductor) and the Right-Hand Grip Rule (for flux/pole determination in a coil).
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