Avery long (nearly infinite) wire is made of an insulating material. the wire carries a charge, q, which is distributed evenly along the entire length of the wire, giving it a uniform linear charge density, lambda. a gaussian cylinder of length l and radius r is coaxial with the wire and encloses a portion of the charged wire. what is the charge enclosed by the gaussian cylinder?

The cylinder is coaxial with the wire, therefore the wire runs through the center of the cylinder's circular faces. The cylinder has a length L, therefore it contains a length of wire L. Therefore the amount of charge inside a length of charged wire is given by:

Q = λL

where Q is the charge, λ is the wire's linear charge density, and L is the length of wire.

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.