Assertion: The current density $\overrightarrow{J}$ at any point in the Ohmic resistor is in the direction of electric field $E$ at that point.
Reason: A point charge when released from rest in a region having only electrostatic field always moves along electric lines of force.

From the following graph between $V$ & $I$, calculate the resistance of the resistor.

In the given figure, there are two similar cells whose EMFs are same and internal resistances are negligible. These cells are connected in parallel What is the value of current flowing through the resistance $R$?

The currents in some branches are given. The currents in remaining resistance ${\mathit{R}}_1\mathit{ }{\mathit{R}}_2$ and ${\mathit{R}}_3$ are respectively