Consider two coupled circuits having self inductances $L_1$ and $L_2$ that carry non-zero currents $I_1$ and $I_2$ respectively. The mutual inductance between the circuit is $M$ with unity coupling coefficient. The stored magnetic energy of the coupled circuit is minimum at which of the following value(s) of $I_1 / I_2$ ?

In the circuit shown below, the magnitude of the voltage V₁ in volts, across the 8 k$$\Omega$$ resistor is ________. (round off to nearest integer).

An air-core radio-frequency transformer as shown has a primary winding and a secondary winding. The mutual inductance $M$ between the windings of the transformer is $\_\_\_\_$ $\mu \mathrm{H}$. (Round off to 2 decimal places)

The current i (in Ampere) in the 2 Ω resistor of the given network is _________.