6. In a standard lecture demonstration, a loop of wire, with radius a and resistance R, levitates over a magnetic-field producing coil. loop of wire i = i, cos ot Assuming the B field is uniform and vertical in the vicinity of the loop, and has mag- nitude given by |B| = Bo cos wt, find the current in the loop, ignoring self-inductance. Find the magnitude of the magnetic force. Can you explain why the loop stays up? 7. In the preceding problems it was stated that self-inductance was to be ignored. How would the solutions be modified if self-inductance were not ignored?

A solenoid with 25 turns per centimeter carries a current of 23 mA. 1)What is the magnetic field in the interior of the coils? (Express your answer to two significant figures.)

The figure above shows a 40.0cm thin metal bar, with mass of 900g, that rests on two conducting metal supports that is connected to a battery and a 25 ohm resistor. The metal bar is placed under a uniform 0.50-T magnetic field. (a) What is the highest voltage, vmax, the battery can have without breaking the circuit at the supports?

Please answer it within 30 minutes.I will upvote! Problem: What is the radius of the path of an electron that travels through a .76 T uniform magnetic field at a speed of 70,000 m.