Question

The primary coil of a transformer contains100 turns; the secondary has 200 turns. The primary coil isconnected to a size-AA battery that supplies a constant voltage of1.5 volts. What voltage would be measured across the secondarycoil? zero

Answer 1

Answer:

There  will be no voltage across  secondary coil because DC voltage source is used in primary coil so there is no electromotive force induced in secondary coil.

Explanation:

In this question we have given

AA battery is used to supplies a constant voltage of 1.5 volts to primary coil of  transformer. In this case, voltage source is DC source which is providing constant voltage and for a transformer to work it is necessary to use an AC source.

Therefore, no EMF will induce in the secondary coil

and we know that in a transformer,

$\frac{E_{2} }{E_{1}} =\frac{V_{2} }{V_{1} }=\frac{N_{2} }{N_{1} }$...........(1)

hence from above equation it is clear that,

$\frac{E_{2} }{E_{1}} =\frac{V_{2} }{V_{1}}$............(2)

Here ,

$E_{2}=0$

Put $E_{2}=0$ in equation (2)

We got

$V_{2}=0$

There  will be no voltage across  secondary coil because there is no electromotive force induced in secondary coil.