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If polarity at the ends A and B of the bar AB
is tested with a compass needle, it is found that
the polarity developed at end A is north (opposite
to the polarity of the magnet near end A) and the
polarity at end B is south (i.e., similar to the
polarity at the end of the magnet near end A).
Thus,
Answers
Answer:
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Explanation:
The polarity of the magnetic field (that is, which end is magnetic-north or magnetic-south) can easily be found from the Right hand thumb rule. If we hold the solenoid in our right hand, so that the fingers curl around it in the direction of the conventional current flow, then the thumb will point to the north pole of the magnet. Also, a solenoid when suspended freely aligns itself in the north-south direction, thus behaving like a bar magnet. One end of the solenoid acts like a north pole and the other end the south pole.
The polarity of the solenoid AB can be changed by reversing the direction of the current. If we imagine that we are facing the coil end-on, then if the current flows in a clockwise direction, we are looking at the south pole. If the current flows in an anticlockwise direction, we are looking at the north pole. Hence, the polarity at A is north and polarity at B is south.
When magnet is brought closer to the A end of the solenoid AB with the north pole, they repel each other because like poles repel each other. This is the fundamental principle of magnetism.