Resistors $R^{}_{1}$ and $R^{}_{2}$ have an equivalent resistance of 6 ohms when connected in the circuit shown below. The resistance of $R_1$ could be:

When temperature of the conductor is increased, then the collision frequency between current carries ( electrons ) and atoms increases. This results in

$10$ wires (same length, same area, same material) are connected in parallel and each has $1\Omega$ resistance, then the equivalent resistance will be

Six identical cells, each of emf of $6V$, are connected in parallel. The net emf across the battery is

The equivalent resistance between A and B in the following figure is-