A wire is strung horizontally between two posts so that the current through the

Question

A wire is strung horizontally between two posts so that the current through the wire points away from the observer. A magnetic field is then produced in the region of the wire so that it points toward the observer and parallel to the wire. The observer will see the wire defect?

to the right, to the left, downward, upward, not at all. which one?

A wire is strung horizontally between two posts so that the current through the wire points away from the observer. A magnetic field is then produced in the region of the wire so that it points vertically upward. The observer will see the wire defect?

to the right, to the left, downward, upward, not at all. which one?

Consider a circular loop of wire which is lying on the table in front of you. This loop is in a region of space in which the magnetic field points vertically upward through the table. You now connect the loop to a circuit so that the current flows in the counterclockwise direction (as viewed from above looking down). In which direction does the magnetic force point?

Explanation / Answer

F = B*I*L* sin thetha
where thetha is angle between direction of current and magnetic field
Here thetha = 180
so, sin thetha = sin 180 = 0
so force = 0
Answer: not at all
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F= B*I*L* sin thetha
If non zero,direction of F is given by cross product of I and B direction
Here IXB points to the left
Answer: to the left

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F= B*I*L* sin thetha
If non zero,direction of F is given by cross product of I and B direction
Here IXB points to the outward
Answer: to the outward

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