$A$ solenoid is at a potential difference of $60\, V$ and the current flowing through it is $15\, A$. The resistance of the coil will be ............ $\Omega$.

The current flowing through a circuit is shown in the figure. What is the resistance of the circuit?

$E$ is the electric field inside a conductor whose material has conductivity $\sigma$ and resistivity $\rho$. The current density inside the conductor is $J$. The correct form of Ohm's law is

Which of the following graphs represents an ohmic resistor?

The correct setup to verify Ohm's law is:

$A$ conductor behaves as a superconductor: