Question

what is the effect on polarity of solenoid when the direction of current is changed?​

Answer 1

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The polarity of solenoid increases when the direction of current is changed.

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Answer 2

The magnetic field generated is always perpendicular to the direction of the current and parallel to the solonoid. Hence if we reverse the current the direction of magnetism also reverses. In other words the magnetic poles gets reversed (North pole becomes south pole and the south pole becomes the north pole).