In Class 10 Physics (Magnetic Effects of Electric Current), Fleming's Left-Hand Rule is a simple and brilliant way to predict the direction of force acting on a wire that carries electricity through a magnetic field.
John Ambrose Fleming, the English electrical engineer who invented this hand rule in the late 19th century, was also the inventor of the first vacuum tube, which revolutionized early electronics and radio.
Stretch the thumb, forefinger (index finger), and middle finger of your left hand such that they are mutually perpendicular (at 90 degrees) to each other.
To remember which finger is which, use the acronym FBI (like the police agency):
This rule is exactly the principle used in an Electric Motor. When you pass electricity (current) through a coil of wire that sits between two magnets (magnetic field), the wire experiences a force (thumb) that pushes it up or down, making the motor spin.
The **Left-Hand Rule** is used for *Electric Motors* (to find the direction of Force when current is given). The **Right-Hand Rule** is used for *Electric Generators* (to find the direction of Induced Current when motion is given).
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