Heating a magnet with fire to demagnetise it.
(b) hammering a magnet to.
fig 5.1.17 demagnetiziation
self assessment questions
the point on a magnet where magnetic effect is strongest is called
a) neutral point.
b) magnetic pole.
c) magnetic dip.
d) magnetic flux.

what's the

the answer is minerals.

answer: semi-infinite solid initially at a uniform temperature of 400 ◦c is cooled at its surface by convection. the cooling fluid at a constant temperature of 200 ◦c has a convective coefficient (ha) of 250 w/m2.k. the physical properties of the solid: k = 20 w/m.k and α = 4 * 10-5  m2/s. using δx = 0.04 m and δt = 10 s. write the finite difference equations describing the transient heat transfer of the first five δx and the temperature profile after 30 s.