Magnetic field due to currentHard
Question
Due to the presence of the current I1 at the origin
Options
A.The forces on AB and DC are zero
B.The forces on AD and BC are zero
C.The magnitude of the net force on the loop is given by 
D.The magnitude of the net force on the loop is given by 
Solution
The forces on AD and BC are zero because magnetic field due to a straight wire on AD and BC is parallel to elementary length of the loop.
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