Force on parallel wires: A long straight conductor has a constant current flowing to the right. A wire rectangle is situated above the wire, and also has a constant current flowing through it (as shown in the figure) . Which of the following statements is true? 
A) The net magnetic force on the wire rectangle is upward, and there is also a net torque on the it.
B) The net magnetic force on the wire rectangle is zero, and the net torque on it is zero.
C) The net magnetic force on the wire rectangle is downward, and there is also a net torque on the it.
D) The net magnetic force on the wire rectangle is zero, but there is a net torque on it.
E) The net magnetic force on the wire rectangle is downward, and the net torque on it is zero.
Correct Answer:
Verified
Q1: Direction of magnetic fields: A horizontal wire
Q2: Field due to a long wire: Two
Q3: Field due to a long wire: A
Q4: Direction of magnetic fields: A vertical wire
Q5: Field due to a long wire: Two
Q7: Force on parallel wires: The figure shows
Q8: Force on parallel wires: The figure shows
Q9: Force on moving charges: An electron, moving
Q10: Force on moving charges: An electron moving
Q11: Field due to circular loop: A ring
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