Aflat rectangular loop of wire carrying a 4.0-a current is placed in a uniform 0.60-t magnetic field. the magnitude of the torque acting on this loop when the plane of the loop makes a 30° angle with the field is measured to be 1.1 n ∙ m. what is the area of this loop?

Torque on a closed current carrying loop is given by formula

here

N = number of turns = 1

i = current = 4 A

A = area of the loop

B = magnetic field = 0.60 T

= angle between normal of the plane and magnetic field = 90 - 30 = 60 degree

Now we will have

So area of the loop is 0.53 m^2

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.