1
JEE Main 2020 (Online) 4th September Morning Slot
MCQ (Single Correct Answer)
+4
-1
Change Language
A small bar magnet placed with its axis
at 30o with an external field of 0.06 T
experiences a torque of 0.018 Nm. The
minimum work required to rotate it from its
stable to unstable equilibrium position is :
A
6.4 $$ \times $$ 10-2 J
B
9.2 $$ \times $$ 10-3 J
C
7.2 $$ \times $$ 10-2 J
D
11.7 $$ \times $$ 10-3 J
2
JEE Main 2020 (Online) 3rd September Evening Slot
MCQ (Single Correct Answer)
+4
-1
Change Language
A perfectly diamagnetic sphere has a small spherical cavity at its centre, which is filled with a paramagnetic substance. The whole system is placed in a uniform magnetic field $$\overrightarrow B $$ . Then the field inside the paramagnetic substance is : JEE Main 2020 (Online) 3rd September Evening Slot Physics - Magnetic Properties of Matter Question 37 English
A
$$\overrightarrow B $$
B
zero
C
much large than $$\left| {\overrightarrow B } \right|$$ and parallel to $$\overrightarrow B $$
D
much large than $$\left| {\overrightarrow B } \right|$$ but opposite to $$\overrightarrow B $$
3
JEE Main 2020 (Online) 2nd September Morning Slot
MCQ (Single Correct Answer)
+4
-1
Out of Syllabus
Change Language
Magnetic materials used for making permanent magnets (P) and magnets in a transformer (T) have different properties of the following, which property best matches for the type of magnet required?
A
T : Large retentivity, small coercivity
B
P : Large retentivity, large coercivity
C
P : Small retentivity, large coercivity
D
T : Large retentivity, large coercivity
4
JEE Main 2020 (Online) 7th January Evening Slot
MCQ (Single Correct Answer)
+4
-1
Out of Syllabus
Change Language
JEE Main 2020 (Online) 7th January Evening Slot Physics - Magnetic Properties of Matter Question 40 English The figure gives experimentally measured B vs H variation in a ferromagnetic material. The retentivity, coercivity and saturation, respectively, of the material are :
A
1.0 T, 50A/m and 1.5 T
B
1.5 T, 50 A/m and 1.0 T
C
1.5 T, 50 A/m and 2.0 T
D
150 A/m, 1.0 T and 1.5 T
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