In the circuit shown in figure,

In the given circuit, the value of $m$ is varying. The correct statements about the circuit are

In the given circuit, mark the correct statement/statements

In the circuit, various resistances and five batteries are connected as shown in the figure. If point $O$ is earthed,

Inside a superconducting ring, six identical resistors each of resistance $R$ are connected as shown in figure. The equivalent resistance(s),

Inside a superconducting ring, six identical resistors each of resistance $R$ are connected as shown in figure. The equivalent resistance(s),

Inside a superconducting ring, six identical resistors each of resistance $R$ are connected as shown in figure.

In the circuit shown, the resistances are given in ohms and the battery is assumed ideal with emf equal to $3.0 \mathrm{V}$.