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Question

When a straight conductor carrying current is held over a magnetic needle, such that the current in the conductor flows from north to south, then the north pole of the needle points towards:

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 East
Using the right hand thumb rule (shown in the figure), it can be concluded that the magnetic field due to the current carrying conductor at the compass location is in east direction. Hence, the north-pole of needle points in the east direction.
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