Question
Fri May 25, 2012 By: Shraddha Kunjarkar
 

the current in a straight conductor stretched over a magnetic needle is directed from south to north.the north pole of the needle will point towards which direction..???

Expert Reply
Fri May 25, 2012
The process of producing electricity by magnetic field is called electromagnetic induction.

Electric current can also be induced through a wire loop, by moving it near a fixed magnet. So a current is induced either by moving a magnet near the loop or by moving the loop near a magnet. It is the relative motion between the two which is important. It does not matter which of the two is moved. Thus the electromagnetic induction takes place because of the relative motion between a magnet and a coil. The induced current exists as long as there is a relative motion between the coil and the magnet.

The direction of the current in a wire moving perpendicular to itself and to a magnetic field may be found by Fleming's right hand rule. If the thumb, forefinger and middle finger of the right hand are stretched in a mutually perpendicular direction, in such a way that the forefinger directs towards the magnetic field, the thumb shows the motion of the wire, then the middle finger shows the direction of the induced current.
 
Current will b from west to east.
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