A battery is connected to a uniform resistance wire AB and B is earthed. Which one of the graphs below shows how the current density J varies along AB

A short bar magnet is dropped through a coil of wire of similar length. Which one of the graphs below shows best how the current through the coil varies with time?

A battery consists of a variable number n of identical cells having internal resistance connected in series. The terminals of the battery are short circuited and the current I measured. Which one of the graph below shows the correct relationship between I and n ?

A battery consists of a varialbe number n of identical cells having internal resistance connected in series. The terminals of the battery are short circuited and the current I measured. Which one of the graph below shows the correct relationship between I and n ?

A battery consists of a variable number n of identical cells having internal resistance connected in series. The terminals of the battery are short circuited and the current I measured. Which one of the graph below shows the relationship between I and n?

A electric current passes through non uniform cross-section wire made of homogeneous and isotropic material. If the J_(A) and J_(B) be the current densities and E_(A) and E_(B) be the electric field intensities at A and B respectively, then