In the formula f vector = qv vector * B vector: F vector must be perpendicular t

Question

In the formula f vector = qv vector * B vector: F vector must be perpendicular to v vector but not necessarily to B vector and the magnitude of velocity changes. F vector must be perpendicular to B vector but not necessarily to v vector F vector must be perpendicular to both v vector and B vector and velocity direction changes. magnitude of the velocity same all three vectors must be mutually perpendicular and velocity direction and magnitude changes. v vector must be perpendicular to B vector but not necessarily to F vector Two long parallel straight wires carry equal currents in opposite directions. At a point midway between the wires, the magnetic field they produce is: zero non - zero and along a line connecting the wires non - zero and parallel to the wires non - zero and perpendicular to the plane of the two wires none of the above

Explanation / Answer

Q.1. Option D is correct. Use Fleming left hand rule to under stand. Which states that "Stretch the first finger, central finger and thumb of your left hand in mutually perpendicular directions if the first finger points in the direction of the magnetic field, the central finger points in the direction of motion of the charge, then erect thumb gives the dirction of the force"

Q.2. Option D is correct because both will produce magnetic field of same strength and in same directions.

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