Assertion : The current density $\overrightarrow{J}$ at any point in ohmic resistor is in direction of electric field $\overrightarrow{E}$ 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.

Assertion : In the following circuit emf is $2 \mathrm{V}$ , internal resistance of the cell is $1 \mathrm{\Omega }$ and $R=1 \mathrm{\Omega }$ Then reading of the voltmeter is $1 \mathrm{V}$$.$

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Reason : $V=E-ir, i=\frac{2}{2}=1 \mathrm{A}$ and $r=1 \mathrm{\Omega }$

A wire of resistance $12 \mathrm{\Omega } {\mathrm{m}}^{-1}$ is bent to form a complete circle of radius $10 \mathrm{cm}.$ The resistance between its two diametrically opposite points, $A$ and $B$ as shown in the figure is

See the electrical circuit shown in this figure. Which of the following equations is a correct equation ion It?

In the circuit shown in the figure, if potential at point $A$ is taken to be zero the potential at point $B$ is