Which of the following is/are true in case of magnetic needle placed below current carrying conductor?

For an electric current from South to North, the compass needle gets deflected towards West direction.

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For an electric current from South to North, the compass needle gets deflected towards East direction.

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For an electric current from North to South, the compass needle gets deflected towards East direction.

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There will not be any deflection in the needle.

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Solution

The correct options are
A For an electric current from South to North, the compass needle gets deflected towards West direction.
C For an electric current from North to South, the compass needle gets deflected towards East direction.
When electric current is passed through the wire from South to North directions and the wire is placed over the compass needle, the compass needle gets deflected towards West direction, and if we reverse the direction of current in the wire, the compass needle gets deflected in the opposite direction.

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