In the picture below, the two wires carry current i1 and i2, respectively, with

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. Answer true or false for the following:

If i1 is less than i2, then the force on q is south..

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

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

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

If i2 = - i1 then the force on q equals zero.

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

If i2 = 0 and i1 is greater than zero, then the force on q points into the page.

Explanation / Answer

If i1 is less than i2, then the force on q is south..

True

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

Ans :  True, parallel currents attract.

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

Ans : True, Magnetic forces are created by moving charges (qv × B).

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

Ans: True

If i2 = - i1 then the force on q equals zero.

Ans: False, In this case, both wires produce a magnetic field out of the page at q and the force is downward.

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

Ans :  False, The top wire produces a magnetic field into the page at q (right hand rule )

If i2 = 0 and i1 is greater than zero, then the force on q points into the page.

Ans: True

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