Answer:a
Step-by-step explanation:
That’s one cracked screen
The answer is D from picture you posted .
Answer:

Step-by-step explanation:
Given voltage of primary coil is 
And voltage of secondary coil is 
A transformer is a device that contains primary and secondary coil. These coils are mounted on soft iron. The change in voltage depends upon the number of turns of primary coil
and secondary coil
.
Following equation represents the relation between them.

Then, ratio of the number of wire turns on the primary coil to the number of turns on the secondary coil is

Answer:
hard
Step-by-step explanation:
I don't know because I have never learnt these things
Answer:
D
Step-by-step explanation: