Which representation shows the relationship between resistance and the length of a wire? R∝1L2R∝1L2

R∝LR∝L

R∝1LR∝1L

R∝L2

What is relative velocity? in which condition is relative velocity known by adding the velocity of the first body and that of the second body

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?

Why does lightning travel from clouds to the ground?