A constant electric current (DC current) has been flown through a coil that is h

Question

A constant electric current (DC current) has been flown through a coil that is held vertically as shown in the figure above. The coil has a circular cross-section, and the DC current is flown in counter clock-wise direction when viewed from the top of the coil.The coil is fixed in space so that it does not move, and the current has been applied for a long time. In order to understand the properties of a current carrying coil, a bar magnet is brought near the current carrying coil in three different positions. In position (A), the bar magnet is brought near the top of the coil, in position (B) the bar magnet is brought near the bottom, and in position (C) the bar magnet is brought near the side (outside the magnet). The orientation of the magnets in each position is shown in the figure above. Choose all that are correct from the following.

a)In position (C), the bar magnet does not experience any force or torque because the bar magnet is outside the coil.

b)In position (A), the bar magnet is repelled (or pushed away) from the coil.

c)In position (B), the bar magnet is repelled (or pushed away) from the coil.

Explanation / Answer

Here the magnetic field due to solenoid is upward inside the loop and zero outside the loop

so answer will be C) In position (B), the bar magnet is repelled (or pushed away) from the coil.

As in position B, the magnetic south of solenoid is near to the magnetic south of bar magnet

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