Physics
A straight wire lying in a horizontal plane carries a current from north to south. (a) What will be the direction of magnetic field at a point just underneath it? (b) Name the law used to arrive at the answer in part (a).
Electro-Magnetism
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Answer
(a) When a straight wire is lying in a horizontal plane and carrying current from north to south then the direction of magnetic field at a point just underneath is towards east.
(b) The law used is right hand thumb rule.
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