In the picture below, the two wires carry current i 1 and i 2 , respectively, wi

Question

In the picture below, the two wires carry current i1 and i2, respectively, with positive current to the right. The charge q is positive and has velocity v to the right.

1. If i1 = - i2, then the wires repel each other.

2. If i2 = 0 and i1 is greater than zero, then the force on q points into the page.
3. If i1 is greater than i2, then the force on q is north.
4. If i1 = 0 and i2 is greater than zero, then the magnetic field near charge q points into the page.
5. If v = 0, then the force on q is zero.
6. If i2 = - i1 then the force on q equals zero.
7. If i1 = 0 and i2 is greater than zero then the force on q is south.

Explanation / Answer

the right-hand rule says that there is a magnetic field that goes around a current carrying wire. so if the current is moving to the right in that picture, then the magnetic field would be curling out from the top of the page and going into the bottom of the page...if that makes any sense. You know, if you point your right thumb in the direction of the field then the way your fingers curl is the direction of the magnetic field. If one of the wires has no current, then it wouldn't have any magnetic field either. So...
1) is true
2) is true
3) is false
4) is true
5) is true
6 is true
7) is true

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