1

JEE Main 2019 (Online) 12th April Morning Slot

MCQ (Single Correct Answer)

+4

-1

Out of Syllabus

A magnetic compass needle oscillates 30 times per minute at a place where the dip is 45

^{o}, and 40 times per minute where the dip is 30^{o}. If B_{1}and B_{2}are respectively the total magnetic field due to the earth at the two places, then the ratio $${{{B_1}} \over {{B_2}}}$$ is best given by :2

JEE Main 2019 (Online) 8th April Evening Slot

MCQ (Single Correct Answer)

+4

-1

Two magnetic dipoles X and Y are placed at
a separation d, with their axes perpendicular to
each other. The dipole moment of Y is twice
that of X. A particle of charge q is passing,
through their midpoint P, at angle q = 45° with
the horizontal line, as shown in figure. What
would be the magnitude of force on the particle
at that instant ?

(d is much larger than the dimensions of the dipole)

(d is much larger than the dimensions of the dipole)

3

JEE Main 2019 (Online) 12th January Evening Slot

MCQ (Single Correct Answer)

+4

-1

A paramagnetic material has 10

^{28}atoms/m^{3}. Its magnetic susceptibility at temperature 350 K is 2.8 $$ \times $$ 10^{–4}. Its susceptibility at 300 K is :4

JEE Main 2019 (Online) 11th January Evening Slot

MCQ (Single Correct Answer)

+4

-1

A paramagnetic substance in the form of a cube with sides 1 cm has a magnetic dipole moment of 20 $$ \times $$ 10

^{–6}J/ T when a magnetic intensity of 60 $$ \times $$ 10^{3}A/m is applied. Its magnetic susceptibility isQuestions Asked from Magnetic Properties of Matter (MCQ (Single Correct Answer))

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