G straight wires are parallel and a distance 5 m apart. If both wires carry a current of 2 A in the same direction, what is the magnetic field between the wires at a distance of 3.3 m as measured below the top wire? Note sign denotes direction

Explanation:

Given that,

Current in each wire is 2A

Therefore, i1 = i2 = 2A

The wire are 5m apart

We want to find a magnetic field at a distance 3.3m

Magnetic Field on wire is given as

B= μoI/2πr

Where,

μo is a constant = 4π×10^-7 Tm/A

r is the distance between the two wires

I is the current in the wires

B is the magnetic field

Then, the magnetic field at point 3.3m can be determined by finding the resultant of both magnetic field at that point, .

B = B1 + (-B2)

B = B1 — B2.

If the distance of first wire from the point where will want to find the magnetic field is 3.3m

r1 = 3.3m

Then, the distance of B2 from the same point will be

r2 = 5-3.3 = 1.7m, since the total distance from the wires is 5m.

Then,

B = B1—B2

B = μoI1/2πr1 — μoI2/2πr2

I1 = I2 = I

B = μoI/2πr1 — μoI/2πr2

B = 4π × 10^-7 × 2/2π ×3.3 — 4π×10^-7×2/2π×1.7

B =1.21×10^-7 — 2.35×10^-7

B = — 1.14×10^-7 T

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.

answer: option c.

explanation: