Suppose I have a current carrying solenoid with a strong magnetic field inside and outside it. Now I bring a good compass inside that solenoid now I would like you to tell me the direction of North Pole of that compass in which it will get deflected, either towards the South Pole or North Pole of the solenoid. Please Explain your answer.

For more details please view this:- Where is the deflection of compass needle when placed inside a current carrying solenoid?

  • $\begingroup$ It's not clear to me exactly what your question is. $\endgroup$
    – M. Enns
    Sep 7, 2017 at 0:18
  • $\begingroup$ You have to tell me the direction of deflection of North Pole of a compass when it is placed inside a current carrying solenoid $\endgroup$ Sep 7, 2017 at 0:20
  • $\begingroup$ Will it be deflected towards North Pole of that solenoid or towards South Pole $\endgroup$ Sep 7, 2017 at 0:21
  • 1
    $\begingroup$ "Explain with reason" sounds a lot like a homework question... also "you have to tell me" is not really the tone I think you are looking for. "I would like you to tell me", maybe? $\endgroup$
    – Floris
    Sep 7, 2017 at 1:12
  • $\begingroup$ Arpit, what steps have you taken to solve this problem? $\endgroup$
    – CR Drost
    Sep 7, 2017 at 1:31

2 Answers 2


The compass will line up so that it's field lines align with the field lines of the solenoid. This will mean the north pole of the compass will point towards the north pole of the solenoid.


If the Earth were a giant magnet, what we call the magnetic north pole would be that magnet's south pole. (At the Earth's north pole magnetic field lines enter the Earth.)

The north (seeking) pole of the compass magnet which points normally to the north pole of the Earth (the Earth's magnetic south pole) will point to the south pole of the solenoid.

  • $\begingroup$ You have this backwards. The needle's red half is the north pole of a magnet; Earth's North Pole is the south pole of its magnetic field. $\endgroup$
    – CR Drost
    Sep 7, 2017 at 1:30
  • $\begingroup$ Really? Oh yes, I see you are correct. Interesting. Thanks. I'll back edit that in. $\endgroup$
    – JMLCarter
    Sep 7, 2017 at 1:51

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