Which law establishes the relation between voltage an current ?

Write the relation connecting voltage and time

A coil of resistance 400 Omega and inductance 0.5 H is connected across an alternating voltage of frequency 100 Hz. Calculate the phase difference between voltage and current in the circuit.

You find a sealed box on your door step. You sus pect that the box contain charged metal spheres packed in insulating material. Br Which law explains relation between charge of spheres and electric flux.

Name the law which explains the relation between current and the magnetic field produced by the current.