current electricity Questions

If the galvanometer $G$ does not show any deflection in the circuit shown, the value of $R$ is:

Resistance of a carbon resistor determined from colour codes is $(22000\pm 5\%)\Omega$. The colour of the third band must be:

The magnitude and direction of the current in the following circuit is:

$10$ resistors, each of resistance $R$, are connected in series to a battery of EMF $E$ and negligible internal resistance. When they are instead connected in parallel to the same battery, the current increases $n$ times. The value of $n$ is:

The resistance of a platinum wire at $0^{\circ }\text{C}$ is $2\Omega$ and $6.8\Omega$ at $80^{\circ }\text{C}$. The temperature coefficient of resistance of the wire is: