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

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,

...........(1)

hence from above equation it is clear that,

............(2)

Here ,

Put in equation (2)

We got

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

can be answered using momentum.

momentum = p

p1= mass1 * velocity1

p1 = p2

therefore

p1 = 6kg * 4m/s

p1 = 24kgm/s

p2=m2 * v2

24 kgm/s = 7kg * v2

v2 = 24 kgm/s / 7kg

v2= 3.42 m/s