Q. A 3.50-m-long, 310 kg steel beam extends horizontally from the point where it has been bolted to the framework of a new building under construction. A 70.0 kg construction worker stands at the far end of the beam.
Q. A 500 turn solenoid with a length of 20 cm and a radius of 1.5 cm carries a current of 3.0 A. A second coil of four turns is wrapped tightly about this solenoid so that it can be considered to have the same radius as the solenoid. Find when the current in the solenoid increases to 7.0 A in a period of 0.90 s.