calculate the work done to stretch an elastic string by 50cm, if a force of 12.5N produces an extension from it.​

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?

If an electric circuit is not grounded it is best to reach out and touch it to provide the ground a.true or b.false

Which inventor was often called the lady edison