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Question
A flat coil ABCD is freely suspended between the poles of a U-shaped permanent magnet with the plane of coil parallel to the magnetic field as shown in the diagram. Now the AB part of the coil will ______.
A flat coil ABCD is freely suspended between the poles of a U-shaped permanent magnet with the plane of coil parallel to the magnetic field as shown in the diagram. Now the AB part of the coil will ______.
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Solution
The correct option is A move out of the plane
Field lines outside a "U" shaped magnet are from its North pole to its South pole. So here the direction of magnetic field lines are from left to right. The polarity of the battery suggests that in the part AB of the coil, the current flows from 'A' to 'B'. So, applying Fleming's left hand rule for the direction of the force, we get the direction to be outside the plane.
move out of the plane
Field lines outside a "U" shaped magnet are from its North pole to its South pole. So here the direction of magnetic field lines are from left to right. The polarity of the battery suggests that in the part AB of the coil, the current flows from 'A' to 'B'. So, applying Fleming's left hand rule for the direction of the force, we get the direction to be outside the plane.
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