1
AIPMT 2005
MCQ (Single Correct Answer)
+4
-1
A coil in the shape of an equilateral triangle of side $$l$$ is suspended between the pole pieces of a permanent magnet such that $$\overrightarrow B $$ is in plane of the coil. If due to a current i in the triangle a torque $$\tau $$ acts on it, the side $$l$$ of the triangle is
A
$${2 \over {\sqrt 3 }}\left( {{\tau \over {Bi}}} \right)$$
B
$$2{\left( {{\tau \over {\sqrt 3 Bi}}} \right)^{1/2}}$$
C
$${2 \over {\sqrt 3 }}{\left( {{\tau \over {Bi}}} \right)^{1/2}}$$
D
$${1 \over {\sqrt 3 }}{\tau \over {Bi}}$$
2
AIPMT 2005
MCQ (Single Correct Answer)
+4
-1
If the magnetic dipole moment of an atom of diamagnetic material, paramagnetic material and ferromagnetic material are denoted by $$\mu $$d, $$\mu $$p and $$\mu $$f respectively, then
A
$${\mu _d} = 0$$ and $$\mu $$p $$ \ne $$ 0
B
$$\mu $$d $$ \ne $$ 0 and $$\mu $$p = 0
C
$$\mu $$p = 0 and $$\mu $$f $$ \ne $$ 0
D
$$\mu $$d $$ \ne $$ 0 and $$\mu $$f $$ \ne $$ 0.
3
AIPMT 2003
MCQ (Single Correct Answer)
+4
-1
A diamagnetic material in a magnetic field moves
A
from stronger to the weaker parts of the field
B
from weaker to the stronger parts of the field
C
perpendicular to the field
D
in none of the above directions
4
AIPMT 2003
MCQ (Single Correct Answer)
+4
-1
According to Curie's law, the magnetic susceptibility of a substance at an absolute temperature $$T$$ is proportional to
A
$$1/T$$
B
$$T$$
C
$$1/T$$2
D
$$T$$2
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