What happens when you shuffle across a carpeted floor? you transfer electrons from your body to the floor and become positively charged. you transfer electrons from you body to the floor and become negatively charged. you pick up electrons from the floor and become positively charged. the floor creates electrons from the movement and you become positively charged.

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?