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Byju's Answer
Standard IX
Physics
Plotting Non Uniform Field Lines
A compass nee...
Question

A compass needle just above a wire in which electrons are moving towards east, will point:

A
east
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B
west
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C
north
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D
south
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Solution

The correct option is C south
A compass needle points towards magnetic south pole(which is the geometric north pole of earth).
When electrons moves towards east, current flows towards west.
Hence magnetic field at point just above the wire is towards geometric north, which is in direction opposite to earth's magnetic field.
Hence the compass points towards south.

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