Question

to change a normal material to a super conductor........
a)cool the material to it's critical temperature.......
b)in the presence of some constant magnetic field..cool the material to it's critical temperature......
(a) or (b)??????
justify...

Answer 1

a is enough.. magnetic feild alters value of critical temperature

Answer 2

b is more feasable

Answer 3

electrical resistance of cetain materials known as supercunductors changes from a non zero value to zero abruptly as thier temperature is lowered below a critical temperature
their critical temperature becmes smaller than critical temp w/o magnetic feild

Answer 4

how?

Answer 5

isn't the critical temp of a material constant ? @yash2651995

Answer 6

@apoorvk @asnaseer

Answer 7

@eliassaab

Answer 8

this might help you
http://hyperphysics.phy-astr.gsu.edu/hbase/solids/scbc.html

Answer 9

what i want isn' there!

Answer 10

materials show superconducting property only in shaded region .... in that link

Answer 11

of course!
it saya that the superconductivity exists for T<Tc
and H<Hc
what it also says is...even if H=0....superconductivity exists.........
what i want is.......at the time of conversion is H necessary???

Answer 12

superconductors are http://en.wikipedia.org/wiki/Diamagnetism critical magnetic fields destroy their superconducting behavior. In order for materials ... magnetic fields must be below Critical value

The answer to your question .. yes at H=0 it exists ... and H is not necessary

Answer 13

so...even if H is present(<Hc)....or not....we can change a material to a superconductor!!!!!
right?

Answer 14

if H<Hc you can by cooling below critical temperature
if H>Hc the superconductivity does not retain

Answer 15

i read that thing in a 2010 iitjee comprehension type question.. so i'd trust it