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Which of the following device is governed by Flemming's Left Hand Rule
Electric Iron
Electric motor
Electric Geyser
Electric Bulb
Electric motor
Fleming's Left-Hand Rule is a mnemonic used to determine the direction of the force acting on a current-carrying conductor placed in a magnetic field. Among the given options, the electric motor is the device that utilizes this principle to convert electrical energy into mechanical energy.
Fleming's Left-Hand Rule is a mnemonic used to determine the direction of the force acting on a current-carrying conductor placed in a magnetic field. Among the given options, the electric motor is the device that utilizes this principle to convert electrical energy into mechanical energy.
Think of it like a swimmer in a current: the magnetic field (index) and the current (middle) act like the cross-currents, and the resulting force (thumb) is the direction in which you are pushed.
Remember 'FBI': F (Force/Thumb), B (Magnetic Field/Index finger), I (Current/Middle finger).
F=I(l├ЧB) тАФ The magnetic force on a conductor where F is force, I is current, l is length vector, and B is magnetic field.
F=BIlsin(╬╕) тАФ Magnitude of the force where ╬╕ is the angle between the conductor and the magnetic field.
When a current-carrying conductor is placed in an external magnetic field, it experiences a magnetic force. According to Fleming's Left-Hand Rule, if the thumb, index finger, and middle finger of the left hand are held mutually perpendicular, the index finger represents the magnetic field, the middle finger represents the direction of current, and the thumb points in the direction of the force (thrust) exerted on the conductor. This force creates the torque that causes the coil of an electric motor to rotate.
Fleming's Left-Hand Rule is exclusively for electric motors (motor effect).
Fleming's Right-Hand Rule is used for generators (induction effect).
The rule applies to any current-carrying conductor in a magnetic field.
Simple graphical method to determine direction.
Eliminates the need for complex vector calculations in basic design.
Limited to perpendicular relationships.
Requires knowledge of field and current orientation beforehand.
Electric motors
Loudspeakers
Galvanometers
Electric iron, geyser, and bulb work on the principle of the Heating Effect of Electric Current (Joule's Law: H=I2Rt), not on magnetic force.
Option A, C, and D are heating-based appliances, whereas Option B is a motion-based device.
B is correct тАФ An electric motor relies on the interaction between a magnetic field and a current-carrying wire, which is described by Fleming's Left-Hand Rule.
Always differentiate: Left Hand = Motor (gives Motion), Right Hand = Generator (gives Current). Use the mnemonic 'L' for Left/Load(Motor) and 'R' for Right/Result(Generation).
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