Two long, parallel wires separated by 5.0 mm each carry a current of 60 A. These two currents are oppositely directed. What is the magnitude of the magnetic field at a point that is between the two wires and 2.0 mm from one of the two wires

Given Information:  

Distance between wires = d = 5 mm = 0.005 m

Current in wires = I = 60 A

Required Information:  

Magnetic field at distance 2 mm between two wires  = B = ?  

B = 0.010 T

Explanation:  

When two parallel wires carrying a current I are separated by a distance d then the magnetic field is given by

B1 = μ₀I/2πd1

B2 = μ₀I/2πd2

Where μ₀= 4πx10⁻⁷ is the permeability of free space

The overall magnitude of magnetic field is

B = B1 + B2

Since the two wires are separated by 0.005 m then

d1 = 0.005 - 0.002 = 0.003 m

d2 = 0.002 m

B1 = 4πx10⁻⁷*60/2π*0.003

B1 = 0.004 T

B2 = 4πx10⁻⁷*60/2π*0.002

B2 = 0.006 T

B = 0.004 + 0.006

B = 0.010 T

Therefore, the magnitude of the magnetic field at a point between two wires and 0.002 m away from one of wire is 0.010 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.