How much voltage is in the primary coil if there are 3200 windings in the
secondary coil, 500 windings in the primary, and 25V in the secondary?

A.3.91v

B.0.256v

C.40,000,000v

D.3725v

Voltage in primary coil is 3.91 V

Explanation:

For transformer we know that the working principle is given as

here we know that

Now we have

answer: at 24 february, 2014 the population gets twice of its initial population.

explanation:

since we have given that

the population for alpha city, t years after january 1, 2004 is given as

first we find out the initial population, i.e. t=0,

so, our quadratic equation becomes,

according to question, we have said that if the population has twice its initial population, then it becomes

so, time taken to reach this above mentioned population is given by

now, we know that time can't be negative so, we take t=9.149 years.

hence, at 24 february, 2014 the population gets twice of its initial population.

explanation:

considering the bohr theory, the type of connection that requires the transfer the answer conuldn't be right