When an object is not moving so the work equals to what

Ared apple is illuminated by a blue light the apple will appear

What are similarities and differences of reflection, refraction, diffraction and absorption?

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?