Asolenoidal coil with 21 turns of wire is wound tightly around another coil with 350 turns. the inner solenoid is 25.0 cm long and has a diameter of 2.50 cm . at a certain time, the current in the inner solenoid is 0.120 a and is increasing at a rate of 1700 a/s. for this time, calculate;

(a) the average magnetic flux through each turn of the innersolenoid;
(b) the mutual inductance of the two solenoids;

A) We need to calculate the Magnetic flux of a Solenoid,

Where B is the magnetic field and A the Area.

Here \mu_0 is the permeability constant, I the current and N number of turns.

Replacing we have,

B) We calculate the mutual inductance, so

c) We calculate the emf

i think the answer is a, hope this is right, that would be my best guess.

the word that best describes martin luther king jr.'s tone in the video is dignified

martin luther king, jr. was a social activist and baptist minister who played a key role in the american civil rights movement from the mid-1950s until his assassination in 1968. the video shows his manner and attitude having or showing a composed or serious manner that is worthy of respect so dignified is the correct answer