How to calculate this operation? m=10kg and L=2500J/kg? What is the Energy? I hope you will give me the correct answer because the last answer was too rude. His known by SOD!

Electromagnetic induction. a coil of wire contains n turns and has an electrical resistance r. the radius of each turn is a. initially, inside the coil there exists a uniform magnetic field of magnitude b0 parallel to the axis of the coil. the magnetic field is then reduced slowly. the current induced in the coil is i. how long does it take for the magnitude of the uniform field to drop to zero?

In an experiment, how can i change human errors? be specific.

If element x has 99 protons how many electrons does it have