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JEE PHYSICS MCQ: MAGNETIC EFFECT OF CURRENT

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Application +4 | -1

A long, cylindrical iron core of cross-sectional area

5.00 \mathrm{~cm}^2

is inserted into a long solenoid having 2000 turns

m^{-1}

and carrying a current

2.00 \mathrm{~A}

. The magnetic field inside the core is found to be

1.57 \mathrm{~T}

. Neglecting the end effects, find the magnetization I of the core and the pole strength developed.

View answer and explanation

Correct option: B

1.25 \times 10^6 \mathrm{~A~m}^{-1};\,\,625 \mathrm{~A~m}

Option B (

1.25 \times 10^6 \mathrm{~A~m}^{-1};\,\,625 \mathrm{~A~m}

) is correct because it correctly calculates the magnetization and pole strength using the given magnetic field and solenoid parameters.

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A needle made of bismuth is suspended freely in a magnetic field. The angle which the needle makes with the magnetic field is: Assertion: If a charged particles is moving in perpendicular uniform magnetic field, its kinetic energy does not change
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, then the ratio

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R_1

R_2

respectively. The ratio of mass of

{X}

{Y}