1. A copper wire of length 25 cm is in a magnetic field of 0.20T. If it has mass of 10g, what is the minimum current during the wire that would cause a magnetic force equal to its weight?
2. A horizontal wire of length 3.0 m carries a current of 6.0 A and is oriented so that the current direction is 50o S of W. The Earth's magnetic field is due north at this point and has a strength of 0.14e-4 T. What is the magnitude of the force on the wire?
3. A circular loop carrying a current of 1.0 A is oriented in a magnetic field of 0.35T. The loop has an area of 0.24 m 2 and is mounted on a axis, perpendicular to the magnetic field, which allows the loop to rotate. i plane of the loop is oriented parallel to the field, what torque is created with the interaction of the loops current and the field?