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Describe flemings left hand rule |
| Answer» <html><body><p>'s left-hand <a href="https://interviewquestions.tuteehub.com/tag/rule-1192038" style="font-weight:bold;" target="_blank" title="Click to know more about RULE">RULE</a> for electric motors is one of a <a href="https://interviewquestions.tuteehub.com/tag/pair-1145723" style="font-weight:bold;" target="_blank" title="Click to know more about PAIR">PAIR</a> of visual mnemonics, the other being Fleming's right-hand rule[1] (for generators). They were originated by John Ambrose Fleming, in the late 19th century, as a simple way of working out the <a href="https://interviewquestions.tuteehub.com/tag/direction-1696" style="font-weight:bold;" target="_blank" title="Click to know more about DIRECTION">DIRECTION</a> of motion in an electric motor, or the direction of electric current in an electric generator.When current flows through a conducting wire, and an external magnetic field is <a href="https://interviewquestions.tuteehub.com/tag/applied-380664" style="font-weight:bold;" target="_blank" title="Click to know more about APPLIED">APPLIED</a> across that flow, the conducting wire experiences a force perpendicular both to that field and to the direction of the current flow (i.e they are mutually perpendicular). A left hand can be held, as shown in the illustration, so as to represent three mutually <a href="https://interviewquestions.tuteehub.com/tag/orthogonal-2900235" style="font-weight:bold;" target="_blank" title="Click to know more about ORTHOGONAL">ORTHOGONAL</a> axes on the thumb, fore finger and middle finger. Each finger is then assigned to a quantity (mechanical force, magnetic field and electric current). The right and left hand are used for generators and motors respectively.</p></body></html> | |