1

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 :

2

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 :

3

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:4

JEE Main 2016 (Online) 10th April Morning Slot

MCQ (Single Correct Answer)

+4

-1

Out of Syllabus

A fighter plane of length 20 m, wing span (distance from tip of one wing to the tip of the other wing) of 15 m and height 5 m is flying towards east over Delhi. Its speed is 240 ms

^{−1}. The earth’s magnetic field over Delhi is 5 $$ \times $$10^{−5}T with the declination angle ~ 0^{o}and dip of $$\theta $$ such that sin $$\theta $$ = 2/3 . If the voltage developed is V_{B}between the lower and upper side of the plane and V_{W}between the tips of the wings then V_{B}and V_{W}are close to :Questions Asked from Magnetic Properties of Matter (MCQ (Single Correct Answer))

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