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JEE PHYSICS MCQ: MAGNETISM AND MATTER

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Application +4 | -1

The relation between

\mu

and

H

for a specimen of iron is given by

\mu = \left( {\frac{{0.8}}{H} + 8 \times {{10}^{ - 4}}} \right)H/m.

The value of

H

which produces flux density of 1 tesla will be

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Correct option: A

250 A/m

Option A (250 A/m) is correct because it is calculated by substituting the given values into the formula B = μH and solving for H.

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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

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Y

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

\mu_{\mathrm{f}}

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