Conductance is inverse of resistance.
Conductance is given by
σ=R1
Substituting R=ρAl, we get
σ=ρlA
If A= constant, then we have
σ∝l1⇒σ1σ2=l2l3
Substituting l2=2l1, we get
σ2=2σ1
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.