Two long parallel wires carry currents of 10 A in opposite directions. they are separated by 40 cm. what is the magnetic field in the plane of the wires that is 20 cm from one wire and 60 cm from the other?

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  1. An object 7.25 cm high is placed 15.1 cm from a convex mirror of radius 55.2cm. (a) What is the image distance?

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