1
JEE Main 2020 (Online) 3rd September Evening Slot
MCQ (Single Correct Answer)
+4
-1
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 36 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 $$\overrightarrow B $$
2
JEE Main 2020 (Online) 2nd September Morning Slot
MCQ (Single Correct Answer)
+4
-1
Out of Syllabus
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
3
JEE Main 2020 (Online) 7th January Evening Slot
MCQ (Single Correct Answer)
+4
-1
Out of Syllabus
JEE Main 2020 (Online) 7th January Evening Slot Physics - Magnetic Properties of Matter Question 39 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
4
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 45o, and 40 times per minute where the dip is 30o. If B1 and B2 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 :
A
1.8
B
2.2
C
0.7
D
3.6
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