Three long, straight wires are carrying currents that have the same magnitude. In C the current is opposite to that in A and B. The wires are equally spaced. Each wire experiences a net force due to the other two wires. Which wire experiences a net force that has the greatest magnitude? The answer is B but not sure why it is not A.
Homework Answers
On wire B the forces due to A and C act in the same direction
and so reinforce each other.
On the other hand, on wires A and C the forces (due to B and C and
A and B
respectively) act in opposite directions and therefore tend to
cancel out. Correct answer
is B.
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