Question

(b) State the principle of working of a step-up transformer. Deduce the
expression for the secondary to primary voltage in terms of the number of
turns in the two coils.
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Answer 1

Answer:

the step up transformer works on the principle of mutual inductions

Explanation:

the indiced emf in the secondary coil would be

E=-Nsdø/dt

the back emf in the primary coil would be

Ep=-Npdø/dt

if the secondary is open circuit the current taken from it would be small

therefore we can write

Es=Vs

and also Ep=Vp if not the circuit would be in infinte loop

therefore Vs/Vp=Ns/Np