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.

True or False?: If v = 0, then the force on q is zero.
True False  If i1 = i2, then the wires are attracted to each other.
True False  If i2 = 0 and i1 is greater than zero, then the force on q points into the page.
True False  If i1 is greater than i2, then the force on q is north.
True False  If i2 = 0 and i1 is greater than zero, then the magnetic field near charge q points out of the page.
True False  If i2 = - i1 then the force on q equals zero.
True False  If i2 = 0 and i1 is greater than zero, then the force on q is north.

Explanation / Answer

If v = 0, then the force on q is zero. True

f = qvB = 0

If i1 = i2, then the wires are attracted to each other. - True

If i2 = 0 and i1 is greater than zero, then the force on q points into the page. - True (According to fleming's left hand rule)

If i1 is greater than i2, then the force on q is north. - True

If i2 = 0 and i1 is greater than zero, then the magnetic field near charge q points out of the page. - False

If i2 = - i1 then the force on q equals zero. - False (At q, the net magnetic field is additive so force is not equal to zero)

If i2 = 0 and i1 is greater than zero, then the force on q is north. - False

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