What is the magnetic field (expressed in gauss) of a refrigerator magnet with a magnetic field of 0.3 T

When you turn on a battery-operated device, an electrical circuit is

Which composition of water moves to begin a deepwater current?

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.