Two parallel conductors are carrying currents in the same direction. The currents are non-zero and not necessarily equal. The magnitude of the magnetic field midway between them is 40 mT. If one of the currents then has its direction reversed, what is the resulting magnitude of the magnetic field midway between them?
a. It could be any value.
c. a value less than 40 mT
b. 40 mT
d. a value greater than 40 mT
Question 2
Doubling the weight suspended vertically from a coil spring will result in a change in the displacement of the spring's lower end by what factor?
a. 4.0
c. 2.0
b. 3.0
d. 0.5
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