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If the current flows in a conductor in East west direction, what will be the deflection of magnetic needle?

 When a current flows through a conductor, it creates a magnetic field around the conductor. According to the right-hand rule, if you point your thumb in the direction of the current, your fingers will curl in the direction of the magnetic field.

For a conductor with current flowing from east to west:

Using Flemings Right Hand Thumb Rule:

  1. Point your right thumb in the direction of the current (west).
  2. Your fingers will curl around the conductor in the direction of the magnetic field.

The magnetic field created by the current will have circular field lines around the conductor. At a point above the conductor, the magnetic field will point towards the north. Below the conductor, it will point towards the south.

When you place a magnetic needle (like a compass) near the conductor, it will align itself with the magnetic field lines.

If the magnetic needle is placed directly above the conductor, the north end of the needle will deflect towards the north. If the needle is placed directly below the conductor, the north end of the needle will deflect towards the south.

In summary, the deflection of the magnetic needle depends on its position relative to the conductor:

  • Above the conductor: The north end of the needle will deflect towards the north.
  • Below the conductor: The north end of the needle will deflect towards the south.
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