A loop of current sits in a magnetic field which points to the right. Current runs through the square loop as shown.

```

mag field B   ------>

_______________________________
|        <------ current        |
|   ________________________    |
|   |                       |   |
|   |                       | ^ |
| | |                       | | |
| | |                       | | |
| | |                       | | |
| | |                       | | |
| | |                       | | |
| v |                       | | |
|   |                       |   |
|   |_______________________|   |
|        --------->             |
|_______________________________|
```

Question 1: What is the direction of the magnetic force on the top section of the loop?

```Answer:  zero, because the current runs anti-parallel to the magnetic field
```

Question 2: What is the direction of the magnetic force on the left section of the loop?

```Answer:  out of the screen
```

Question 3: What is the direction of the magnetic force on the bottom section of the loop?

```Answer:  zero, because the current runs parallel to the magnetic field
```

Question 4: What is the direction of the magnetic force on the right section of the loop?

```Answer:  into the screen
```

Question 5: What is the total force on the loop?

```Answer:  zero -- so it doesn't translate
```

Question 6: What happens if the loop is released?

```Answer:  it rotates, because it feels a net torque due to the equal
but opposite forces pushing on its opposite two legs
```