Question
(a) What is the direction of the force on a wire carrying a current due east in a location where the Earth’s field is due north? Both are parallel to the ground. (b) Calculate the force per meter if the wire carries 20.0 A and the field strength is $3.00 \times 10^{-5} \textrm{ T}$. (c) What diameter copper wire would have its weight supported by this force? (d) Calculate the resistance per meter and the voltage per meter needed.
1. Towards the sky
2. $6.00 \times 10^{-4} \textrm{ N/m}$
3. $9.32 \times 10^{-5} \textrm{ m}$
4. $2.52 \textrm{ } \Omega\textrm{/m}$
$50.4 \textrm{ V/m}$
Solution Video