Question

How is the e.m.f. across primary and secondary coils of a transformer related with the number of turns of coil in them?

Answer 1

Relation between e.m.f in the coils and the number of turns in the coils is given by $\frac{E_s}{E_p}=\frac{N_s}{N_p}$
where, $E_s$ is the e.m.f across secondary coil
$E_p$ is the e.m.f across primary coil.
$N_s$ is the number if turns in the secondary coil.
$N_p$ is the number if turns in the primary coil.