a horizontal straight wire 10m long extending from east to west is falling with speed 5m/s at right angle to the horizontal component ofearth magnetic field . 1)what is direction of emf and how? which emf of the wire is at higher potential?
Answers
According to Fleming's right hand rule, if we stretch the first finger, central finger and thumb of our right hand in mutual direction such that first finger points along the direction of the field and thumb is along the direction of the motion of the conductor, then the central finger would give us the direction of the induced current. Here the wire is falling vertically, therefore the direction of motion of the conductor that is the thumb is in a downward direction.
The magnetic field produced that is the index finger is in the direction of the horizontal component of earth. the induced emf which is the middle finger is perpendicular to both.
Therefore, it is perpendicular to the plane containing the horizontal component and the direction of motion.