Two loops of wire are moving in the vicinity of a very long straight wire carryi

Question

Two loops of wire are moving in the vicinity of a very long straight wire carrying a steady current as shown in the figure below.

a) Select the correct option for each statement:
clockwise, counter clockwise,or no direction
clockwisecounter clockwiseno current The direction of the current flow for the loop to the left of the wire.
clockwisecounter clockwiseno current The direction of the current flow for the loop to the right of the wire.

b) A bar magnet is dropped from above and falls through the loop of wire shown below. The North pole of the bar magnet points downward as it falls. Select the correct option for each statement:

increasingdecreasingno change The change in flux through the loop just before the magnet enters the loop.
increasingdecreasingno change The change in flux through the loop just after the magnet exits the loop.
**increasing, decreasing or no change

upwardsdownwardsno force The force on the bar magnet from the induced magnetic field of the loop, just before it enters the loop.
upwardsdownwardsno force The force on the bar magnet from the induced magnetic field of the loop, just after it exits the loop.
**up ward, downward or no force

updownleftright The direction of the dipole moment of the loop just after the magnet exits the loop. If the loop is approximated to be a magnet, this would be direction of the vector pointing from the South pole to the North pole of the loop.
updownleftright The direction of the dipole moment of the loop just before the magnet enters the loop. If the loop is approximated to be a magnet, this would be direction of the vector pointing from the South pole to the North pole of the loop.

**up, down, left or right

Explanation / Answer

a)

1) no current

2) counter clockwise

b)

1) increasing
2) decreasing

3) upward
4) upward

5) downward
6) upward

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