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

the arctic is a region of the planet, north of the arctic circle, and includes the arctic ocean, greenland, baffin island, other smaller northern islands, and the far northern parts of europe, russia (siberia), alaska and canada.

answer: the exterior temperature of commercial jet planes as they leave the stratosphere and return to the ground increases steadily.

explanation:

the lower most layer of atmosphere is troposphere which extends from 0 to 12 km above the surface of the earth. the temperature initially decreases as distance is increased from the earth's surface. commercial jets fly in lower part of the stratosphere. the stratosphere extends upto 50 km. the temperature in stratosphere starts rising again due to presence of ozone which traps the uv rays.

thus, when the planes leave the stratosphere and return to the ground, the exterior temperature increases steadily.