week 12 force generated by magnetic field

Where is the direction of magnetic flux density

• x

• y

• z

• xy

what is the r for side 1

• 1

• 2

• 3

• 4

why the force acting on side 2 is zero?

• because the current is too small

• because the cross product of unit vector od dl and unit vector r are both y

• because the cross product of unit vector od dl and unit vector r are both x

• because the cross product of unit vector od dl and unit vector r are both z

why B at side 1 is fifferent compare to side 2, side 3 and side 4?

• because the distance is different

• because it is perpendular to I1

• because the current flow in different direction

• because the shape is rectangular

which of the following statements are TRUE? (more than one answer)

• force will be only acting on the wire in square loop if they are perpendicular to I1

• force will be only acting on the wire in square loop if they are parallel to I1

• if the current I2 are in the opposite direction, the force on side 2 and side 4 is not zero

• the magnetic flux density is smaller at a distance that is further away from I1.