Conductance is inverse of resistance.
Conductance is given by
$\sigma=\frac{1}{R}$
Substituting $R=\rho \frac{l}{A}$, we get
$\sigma=\frac{A}{\rho l}$
If $A=$ constant, then we have
$\sigma \propto \frac{1}{l} \Rightarrow \frac{\sigma_{2}}{\sigma_{1}}=\frac{l_{3}}{l_{2}}$
Substituting $l_{2}=2 l_{1}$, we get
$\sigma_{2}=\frac{\sigma_{1}}{2}$
Therefore, conductance will be halved.
Electromagnetic Induction is a current produced by the voltage production due to a changing magnetic field. This happens in one of the two conditions:-
When we place the conductor in a changing magnetic field.
When the conductor constantly moves in a stationary field.