Question

how will you determine the polarity when current is passed through a soleniod​

Answer 1

Answer:

You can determine the polarity of a solenoid by using Clock Rule. Look at the face of loop, if the current around that face is in anticlockwise direction, the face has the north polarity while if the current at that fave is in clockwise direction, the face has the South polarity.

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Answer 2

Answer:

we know that a current carrying solenoid itself behaves like a bar magnet. so its very simple to determine it's polarity...The polarity of the magnetic field (that is, which end is magnetic-north or magnetic-south) can 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.

or

take another bar magnet with poles marked... like poles repel and unlike poles attract so.. you can find out the polarity.