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JEE PHYSICS MCQ: MAGNETISM AND MATTER

1 Medium

1 of 1

Application +4 | -1

A specimen of iron of permeability

8 \times 10^{-3}

weber/amp

\times

metre is placed in a magnetic field of strength

160 \mathrm{amp} /

metre. Then magnetic induction in this iron is -

View answer and explanation

Correct option: B

1.28 \mathrm{wb} / \mathrm{m}^2

Option B (

1.28 \mathrm{wb} / \mathrm{m}^2

) is correct because it's calculated directly from the formula relating magnetic induction, permeability, and magnetic field strength.

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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