Awave with a frequency of 60 hz is traveling along a string whose linear mass density is 230 g/m and whose tension is 65 n. if the wave is to transfer energy at a rate of 75 w, what should the amplitude of the wave be?

Along wire carrying a 4.2 a current perpendicular to the xy-plane intersects the x-axis at x=−1.7cm. a second, parallel wire carrying a 3.0 a current intersects the x-axis at x=+1.7cm. part a at what point on the x-axis is the magnetic field zero if the two currents are in the same direction? express your answer to two significant figures and include the appropriate units.