In the picture below, the two wires carry current i 1 and i 2 , respectively, wi
ID: 1391436 • Letter: I
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
If i1 = 0 and i2 is greater than zero then the force on q is south.
If i1 = 0 and i2 is greater than zero, then the force on q points out of the page.
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 i1 is greater than i2, then the force on q is north.
If v = 0, then the force on q is zero.
If i1 = - i2, then the wires repel each other.
Explanation / Answer
the magnetic field at the point where q is moving due to I2 =
B2 = uo*I2/2*pi*r out of the page
Bnet = B1 - B2
force acting on the harge F = q*v*Bnet
1)
i1 = 0
B2 in out z
v is right (i)
Fb = q*(v cross B2) -j in down wards (south) TRUE
----------
2)
FALSE
3)
i2 = -i1
the net magnetic field is in to the page
Fb is upwards FALSE
-----------
4)
i1 > 0
B1 is in to the page
Fb is in upwards (north) FALSE
-----------
5)
i1 > i2
Bnet is in in to the page
Fb is in upwards(north) TRUE
---------
6)
F = 0
TRUE
--------
B1 at the wire 2 is in out
F = I2*(L2 cross B1)
L2 is right
F is down wards
they repel
TRUE
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