Option A – 200
in a transformer, ES/EP = Ns/Np
where Es = e.m.f (voltage) of the secondary
Ep = e.m.f(voltage)of the primary
Ns = no. of turns in the secondary
Np = no. of turns in the primary.
since Es = Vs; and Ep= Vp.
Vs/ Vp= Ns/Np