True False If i 1 is greater than i 2 , then the force on q is north. True False

Question

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

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.

Explanation / Answer

1 ) True ( net magnetic field is into the page and hence by fleming's left hand rule, the force is northwards on q)

2) True ( Using Fleming's left hand rule , clearly , the two wire s attract each other)

3) False
( Use right hand palm rule, we get the magnetic field to be pointing out of the page)

4) False
( if i2 = -i1 , we have the net magnetic field into the page which gives a non zero force on q )

5) True ( F= qvB , if v= 0 , then force =0)

6) False ( it points northwards)

7) True ( use fleming's left hand rule, the net force is pointing northwards)

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