Two infinite long wires, each carrying c...

Two infinite long wires, each carrying current I, are lying along x- and y-axis, respectively. A charged particle, having a charge q and mass m, is projected with a velocity u along the straight line OP. The path of the particle is (neglect gravity)

Straight line

circle

helix

cycloid

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The correct Answer is:

(a) B at all the point lying on OP is zero so u will not be affected
by the magnetic force. Hence, it moves on a straight line.

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