1
JEE Main 2020 (Online) 4th September Morning Slot
MCQ (Single Correct Answer)
+4
-1
Change Language
A beam of plane polarised light of large
cross-sectional area and uniform intensity
of 3.3 Wm-2 falls normally on a
polariser (cross sectional area 3 $$ \times $$ 10-4 m2) which
rotates about its axis with an angular speed
of 31.4 rad/s. The energy of light passing through
the polariser per revolution, is close to :
A
1.0 $$ \times $$ 10-5 J
B
1.0 $$ \times $$ 10-4 J
C
1.5 $$ \times $$ 10-4 J
D
5.0 $$ \times $$ 10-4 J
2
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
3
JEE Main 2020 (Online) 4th September Morning Slot
MCQ (Single Correct Answer)
+4
-1
Change Language
Two charged thin infinite plane sheets of
uniform surface charge density $${\sigma _ + }$$ and $${\sigma _ - }$$,
where |$${\sigma _ + }$$| > |$${\sigma _ - }$$|, intersect at right angle.
Which of the following best represents the
electric field lines for this system :
A
JEE Main 2020 (Online) 4th September Morning Slot Physics - Electrostatics Question 175 English Option 1
B
JEE Main 2020 (Online) 4th September Morning Slot Physics - Electrostatics Question 175 English Option 2
C
JEE Main 2020 (Online) 4th September Morning Slot Physics - Electrostatics Question 175 English Option 3
D
JEE Main 2020 (Online) 4th September Morning Slot Physics - Electrostatics Question 175 English Option 4
4
JEE Main 2020 (Online) 4th September Morning Slot
Numerical
+4
-0
Change Language
In a compound microscope, the magnified virtual image is formed at a distance of 25 cm from the eye-piece. The focal length of its objective lens is 1 cm. If the magnification is 100 and the tube length of the microscope is 20 cm, then the focal length of the eye-piece lens (in cm) is __________.
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