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

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.

Step-by-step 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,

`(E_(2) )/(E_(1)) =(V_(2) )/(V_(1) )=(N_(2) )/(N_(1) )`...........(1)

hence from above equation it is clear that,

`(E_(2) )/(E_(1)) =(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.