Answer:
t=5.5 mm
Heat dissipation per unit length = 90.477 W/m
Explanation:
Given that
Diameter d = 5 mm ⇒r = 2.5 mm
Conductivity of insulated material K = 0.16 W/mK
Heat transfer coefficient = 20
When thickness reaches up to critical radius of insulation then heat dissipation will be maximum
We know that critical radius of insulation of wire is given as follow
Now by putting the values
So the thickness of insulation
t=8-2.5 mm
t=5.5 mm
As we know that heat transfer due to convection given as follows
Q = hAΔ T
Q=20 x 2 x π x 0.008 x (120-30)
Q = 90.477 W/m
So heat dissipation per unit length = 90.477 W/m
Answer:
It can change negative attitudes to positive ones
Explanation:
When an advert is done to target audience, some of the consumers may have developed a negative attitude towards the product or services before. However, when an advert is properly conveyed, there are chances that the consumers may change to have a positive attitude towards the advertised product or service. In conclusion, advertising can affect attitudes but cannot alter values or force people to do things they do not want to do or believe are wrong.
Answer:
Explanation:
The concept of amperes law is applied;
Given the current density vector in the medium is J,
the electric flux density vector is D,
and the magnetic flux density vector is B. The line integral of the magnetic field intensity H
considering the orientation of the contour is adopted according to ampere law;
deta x B = Jc + JD
delta x B = Jc + partial differential D/partial differential t
where Jc = conduction current density
JD = displacement current density
The answer is B I believe