Due to the presence of the current I_1 at the origin

JEE Main 2009 Physics question

Due to the presence of the current at the origin

(1)The forces on AB and DC are zero
(2)The forces on AD and BC are zeroCorrect
(3)The magnitude of the net force on the loop is given by
(4)The magnitude of the net force on the loop is given by

Answer: (2)

Solution

The field of the straight wire at O is circular around it, i.e. tangential to the arcs AD and BC. The current in the arcs is parallel/antiparallel to this field, so the forces on the arcs are zero, option (2). The

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Question ID VK-039130