two straight, parallel conductors situated a distance l from each other carry currents in opposite directions as shown below. one conductor carries a current of 1.0 a and the other carries a current of 3.0 a. the magnitude of the magnetic flux density at a point that is distance l to the right of the right conductor is br and that at another point that is distance l to the left of the left conductor is bl. determine the ratio bl/br.
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