JEE PHYSICS MCQ: MAGNETISM AND MATTER

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A magnet performs 10 oscillations per minute in a horizontal plane at a place where the angle of dip is 45

^ \circ

and the total intensity is 0.707 CGS units. The number of oscillations per minute at a place where dip angle is 60

^ \circ

and total intensity is 0.5 CGS units will be

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Correct option: B

Option C (400) is correct because the number of turns in the secondary coil can be calculated using the transformer equation, relating the number of turns to the voltage in the primary and secondary coils.

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Curie temperature is the one above which A vibration magnetometer consists of two identical bar magnets placed one over the other such that they are perpendicular and bisect each other. The time period of oscillation in a horizontal magnetic field is

{2^{5/4}}

s. One of the magnets is removed and if the other magnet oscillates in the same field , then the time period in second is The relative permeability of a substance

X

is slightly less than unity and that of substance

Y

is slightly more than unity, then A bar magnet is equivalent to If the magnetic dipole moment of an atom of diamagnetic material, paramagnetic material and ferromagnetic material are denoted by

\mu_{\mathrm{d}}, \mu_{\mathrm{p}}

and

\mu_{\mathrm{f}}

respectively, then :- Which of the following is most suitable for the core of electromagnets