AIPMT 2005 | Magnetism and Matter Question 41 | Physics

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

AIPMT 2003

MCQ (Single Correct Answer)

-1

According to Curie's law, the magnetic susceptibility of a substance at an absolute temperature $$T$$ is proportional to

$$1/T$$

$$T$$

$$1/T$$²

$$T$$²

AIPMT 2003

MCQ (Single Correct Answer)

-1

A diamagnetic material in a magnetic field moves

from stronger to the weaker parts of the field

from weaker to the stronger parts of the field

perpendicular to the field

in none of the above directions

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