1

JEE Main 2019 (Online) 10th January Morning Slot

MCQ (Single Correct Answer)

+4

-1

A magnet of total magnetic moment 10

^{-2}$${\widehat i}$$ A-m^{2}is placed in a time varying magnetic field, B$${\widehat i}$$ (cos $$\omega t$$) where B = 1 Tesla and $$\omega $$ = 0.125 rad/s. The work done for reversing the direction of the magnetic moment at t = 1 second, is -2

JEE Main 2019 (Online) 9th January Morning Slot

MCQ (Single Correct Answer)

+4

-1

A bar magnet is demagnetized by inserting it inside a solenoid of length 0.2 m, 100 turns, and carrying a current of 5.2 A. The corecivity of the bar magnet is :

3

JEE Main 2018 (Online) 15th April Morning Slot

MCQ (Single Correct Answer)

+4

-1

The $$B$$-$$H$$ curve for a ferromagnet is shown in the figure. The ferromagnet is placed inside a long solended with $$1000$$ turns/cm. The current that should be passed in the solended to demagnetise the ferromagnet completely is :

4

JEE Main 2017 (Offline)

MCQ (Single Correct Answer)

+4

-1

A magnetic needle of magnetic moment 6.7 $$\times$$ 10

^{-2}A m^{2}and moment of inertia 7.5 $$\times$$ 10^{-6}kg m^{2}is performing simple harmonic oscillations in a magnetic field of 0.01 T. Time taken for 10 complete oscillations is:Questions Asked from Magnetic Properties of Matter (MCQ (Single Correct Answer))

Number in Brackets after Paper Indicates No. of Questions

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