Answer:
d. f
Explanation:
Based on the principle of operation of transformer, when a.c voltage is applied at the terminal of the primary coil (input coil), an alternating magnetic flux is produced in the iron core which links the secondary coil (output coil).
Also, an alternating e.m.f of <em>the same frequency</em> as that of primary coil (input coil) <u>will be induced in the secondary coil (output coil) by mutual inductance.</u>
Thus, If the input frequency is "f" then the output frequency will be "f" (since the frequency will be the same).
The correct option is "D"
Decreasing the amount of current flowing through the circuit by using a 5 volt battery instead of a 10 volt battery.
Complete Question
The complete question is shown on the first uploaded image
Answer:
The mass of the other block is 
Explanation:
From the question we are told that
Mass of the first block is 
The height is 
The time it takes it is
Generally from kinematic equation

Here u is the initial velocity which zero given that it was at rest initially
So

=> 
=> 
=> 
Generally from the diagram the resultant force due to the weight of the first object and the tension on the string is mathematically represented as

=> 
=> 
=> 
Generally from the diagram the resultant force due to the weight of the second object and the tension on the string is mathematically represented as

=> 
=> 
=> 