An electric wire is connected across a cell of $e.m.f.$ $E$. The current $I$ is measured by an ammeter of resistance $R$. According to Ohm's law,which of the following relations is correct?

The charge $q$ (in coulomb) passing through a $10 \, \Omega$ resistor as a function of time $t$ (in second) is given by $q = 3t^2 - 2t + 6$. The potential difference across the ends of the resistor at time $t = 5 \, s$ is: (in $V$)

Which of the following circuits is correct for the verification of Ohm's law?

The $I-V$ graphs for two different electrical appliances $P$ and $Q$ are shown in the diagram. If $R_P$ and $R_Q$ are the resistances of the devices,then:

The resistance as shown in the figure is negative at

Assertion : Ohm's law is applicable for all conducting elements.
Reason : Ohm's law is a fundamental law.