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/ False

(T/F) If i1 = 0 and i2 is greater than zero, then the magnetic field near charge q points into the page.

(T/F) If i1 = - i2, then the wires repel each other.

(T/F) If i2 = - i1 then the force on q equals zero

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

(T/F) If i1 = 0 and i2 is greater than zero then the force on q is south.

(T/F) If i1 is greater than i2, then the force on q is north.

(T/F) If v = 0, then the force on q is zero.

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/ False

Explanation / Answer

(F) If i1 = 0 and i2 is greater than zero, then the magnetic field near charge q points into the page. [ from the right hand rule]
(T) If i1 = - i2, then the wires repel each other. [ similiar currents attract]
(T) If i2 = - i1 then the force on q equals zero [ for a particle in the middle of the wires]
(T) If i2 = 0 and i1 is greater than zero, then the force on q points into the page. [ right hand rule]
(T) If i1 = 0 and i2 is greater than zero then the force on q is south. [ left hand rule for induced force]
(F) If i1 is greater than i2, then the force on q is north. [ it will point south]
(T) If v = 0, then the force on q is zero. [ f = qvB]

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