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.

Ture or False?

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

Explanation / Answer

Part 1)

By Lenz's Law and the right hand rule, this is False (The force is actually double the force from a single current)

Part 2)

False, by the right hand rule, the force is upward

Part 3)

True, if we are calling upward North

Part 4)

True, if we are calling downward South

Part 5)

True, F = qvB so we need a velocity

Part 6)

By the right hand rule, this is True

Part 7)

False, it is downward (South)

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