JEE PHYSICS MCQ: MAGNETISM AND MATTER

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The coil in a tangent galvanometer is 16 cm in radius. If a current of 20 mA is to produce a deflection of

45^\circ

then the number of turns wound on it, is (Take horizontal component of earth’s magnetic field

= 0.36 \times {10^{ - 4}}\mathrm{\;T\;and\;}{\mathrm{\mu }_0} = 4\pi \times {10^{ - 7}}\;\mathrm{Wb\;}{\mathrm{A}^{ - 1}}\mathrm{\;}{\mathrm{m}^{ - 1}}

View answer and explanation

Correct option: B

458

Option B (458) is correct because the number of turns is calculated using the tangent galvanometer formula, relating current, radius, magnetic field, and deflection angle.

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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