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

Question

In the picture below, the two wires carry current i1 and i2 respectively, with positive current to the right. The charge q, midway between the wires, is positive and has velocity v to the right. North is up, East is to the right. Which of the following statements for magnetism are true? (Give ALL correct answers in alphabet order, BCD...) A) If i1 = 0 and i2 is greater than zero, then the force on q points out of the page. B) If i1 = - i2, then the wires repel each other. C) If i1 = - i2, then the force on q is zero. D) If v = 0, then the force on q is zero. E) If i2 = 0 and i1 is greater than zero, then the force on q is north. F) If i1 = 0 and i2 is greater than zero, then the magnetic field near charge q points into the page. G) If i1 is greater than i2, then the force on q is north.

Explanation / Answer

a)

False: The direction of magnetic field due to bottom wire is out of the page. So, the direction of force is south.

b)

False: The direction of magnetic field due to two wire is into the page.

C) Fasle: the magnetic force created by the moving charge is calculated by the F=qVXB.

d)

Flase: The direction of magnetic field due to bottom wire is out of the page. So the force is downward.

e) True: The direction of magnetic field due to top wire at charge q is into the page. So the direction of force is North.

f)  False: The direction of magnetic field due to bottom wire at charge q is out of the page.

g)True. The direction of magnetic field at q due to current I1 is into the page. the direction of magnetic field at charge q due to bottom wire is out of the page. As the current in the top is larger, then force willbe north.

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