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. (It is midway between the two wires,
as shown) ("North" is up the page, "East" is right, and so
on.)
For the statements below, select T-True, F-False.
.
A) If i1 = - i2, then the
force on q is zero.
B) If i1 = 0 and i2 is
greater than zero, then the force on q is south.
C) If i1 = i2, then the
wires are attracted to each other.
D) If i1 is greater than i2, then the force on q is north.
E) If v = 0, then the force on q is
zero.
F) If i2 = 0 and i1 is
greater than zero, then the magnetic field near charge q points out
of the page
ANSWER:
A) False, In this case, both wires produce a magnetic ?eld out of the page at q
and the force is downward.
B) True
C) True, parallel currents attract
D) True, The top wire produces a magnetic ?eld into the page at q. The bottomwire produces a magnetic ?eld pointing out of the page at q. If the top currentis stronger, the force will be north (from qv
1)false
2)true(everything in the question is due to ampere's right hand rule)(it will be downwards)
3)true
4)true
5)true
6)false
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