AIPMT 2006 | Magnetism and Matter Question 39 | Physics

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

$${\mu _d} = 0$$ and $$\mu $$_p $$ \ne $$ 0

$$\mu $$_d $$ \ne $$ 0 and $$\mu $$_p = 0

$$\mu $$_p = 0 and $$\mu $$_f $$ \ne $$ 0

$$\mu $$_d $$ \ne $$ 0 and $$\mu $$_f $$ \ne $$ 0.

AIPMT 2005

MCQ (Single Correct Answer)

-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

$${2 \over {\sqrt 3 }}\left( {{\tau \over {Bi}}} \right)$$

$$2{\left( {{\tau \over {\sqrt 3 Bi}}} \right)^{1/2}}$$

$${2 \over {\sqrt 3 }}{\left( {{\tau \over {Bi}}} \right)^{1/2}}$$

$${1 \over {\sqrt 3 }}{\tau \over {Bi}}$$

AIPMT 2003

MCQ (Single Correct Answer)

-1

A bar magnet is oscillating in the Earth's magnetic field with a period T. What happens to its period and motion if its mass is quadrupled?

motion remains simple harmonic with time period = $$T/2$$

motion remains S.H.M with time period = 2T

motion remains S.H.M with time period = 4T

motion remains S.H.M and period remains nearly constant

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