question_answer

A wire oriented in the east west direction carries a current eastward Direction of the magnetic field at a point to the south of the wire is:

A) Vertically down   

B)   Vertically up

C) North east        

D) South-East

Correct Answer: A

Solution :

[a] Apply right hand palm rule place thumb in the direction of current, then palm gives the direction of \[\vec{B}\], south ward direction [vertically downward]