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According to the right-hand thumb rule, if the thumb points in the direction of the current, the fingers curl in the direction of:
Electric potential
Magnetic field lines
Force on the wire
Electron flow
Magnetic field lines
The right-hand thumb rule is a mnemonic used to determine the orientation of the magnetic field lines generated by an electric current flowing through a straight wire. When the thumb points in the direction of the conventional current, the curled fingers represent the concentric circular paths of the magnetic field lines around the wire.
The right-hand thumb rule is a mnemonic used to determine the orientation of the magnetic field lines generated by an electric current flowing through a straight wire. When the thumb points in the direction of the conventional current, the curled fingers represent the concentric circular paths of the magnetic field lines around the wire.
Imagine holding a screwdriver: if your thumb points in the direction the screw is moving (current), your wrist naturally turns (curls) in the direction of the magnetic field lines.
Grip the wire with your right hand: 'Thumb = Current, Fingers = Field' (TC-FF).
B=2╧Аr╬╝0тАЛIтАЛ тАФ Magnitude of magnetic field at distance r
тИоBтЛЕdl=╬╝0тАЛIencтАЛ тАФ Ampere's circuital law
According to Oersted's discovery, a current-carrying conductor creates a magnetic field. Ampere's circuital law defines this relationship mathematically. The magnetic field intensity B at a distance r from a long straight wire is given by B=2╧Аr╬╝0тАЛIтАЛ. The direction of these circular lines of force is always perpendicular to the direction of current flow, governed by the right-hand grip rule.
The magnetic field lines are concentric circles centered on the wire.
The rule applies to conventional current (positive charge flow).
If the current direction is reversed, the direction of magnetic field lines also reverses.
The magnetic field is strongest near the surface of the wire.
Provides a simple visual method to determine vector direction in 3D space.
Eliminates the need for complex vector cross-product calculations in basic applications.
Only applicable to right-handed coordinate systems.
Confusing if students mistakenly use the left hand.
Determining field orientation around current-carrying cables.
Analyzing the polarity of electromagnets and solenoids.
Magnetic field unit in SI is Tesla (T).
Option A is related to work done/voltage, Option C is determined by Fleming's Left-Hand Rule, and Option D is the opposite of conventional current direction.
B is correct тАФ According to the right-hand thumb rule, the curled fingers point in the direction of the magnetic field lines produced by the electric current.
Don't confuse this with Fleming's Left-Hand Rule; use the Right-Hand Rule for magnetic fields around a wire, and the Left-Hand Rule for the force on a wire placed in an external magnetic field.
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