1
JEE Main 2019 (Online) 11th January Evening Slot
+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 $$\times$$ 103 A/m is applied. Its magnetic susceptibility is
A
3.3 $$\times$$ 10–4
B
2.3 $$\times$$ 10–2
C
4.3 $$\times$$ 10–2
D
3.3 $$\times$$ 10–2
2
JEE Main 2019 (Online) 10th January Evening Slot
+4
-1
Out of Syllabus
At some location on earth, the horizontal component of earth’s magnetic field is 18 × 10–6 T. At this location, magnetic needle of length 0.12 m and pole strength 1.8 Am is suspended from its mid-point using a thread, it makes 45o angle with horizontal in equilibrium. To keep this needle horizontal, the vertical force that should be applied at one of its ends is -
A
3.6 $$\times$$ 10$$-$$5 N
B
1.8 $$\times$$ 10$$-$$5 N
C
1.3 $$\times$$ 10$$-$$5 N
D
6.5 $$\times$$ 10$$-$$5 N
3
JEE Main 2019 (Online) 10th January Morning Slot
+4
-1
A magnet of total magnetic moment 10-2 $${\widehat i}$$ A-m2 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 -
A
0.014 J
B
0.028 J
C
0.01 J
D
0.007 J
4
JEE Main 2019 (Online) 9th January Morning Slot
+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 :
A
285 A/m
B
2600 A/m
C
520 A/m
D
1200 A/m
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