Question

Assertion (A) : The current density (J) at a point in a conducting wire is in the direction of electric field (E) at that point. Reason (R) : A conducting wire obeys Ohm's law.

Assertion (A) : The equivalent resistance between points A and B in the given network is 2R. Reason (R) : All the resistors are connected in parallel.

Define mobility of electrons. Give its SI units.

A steady current flows through a wire AB, as shown in the figure. What happens to the electric field and the drift velocity along the wire ? Justify your answer.