1
JEE Main 2020 (Online) 3rd September Morning Slot
MCQ (Single Correct Answer)
+4
-1
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Two isolated conducting spheres S1 and S2 of radius $${2 \over 3}R$$ and $${1 \over 3}R$$ have 12 $$\mu $$C and –3 $$\mu $$C charges, respectively, and are at a large distance from each other. They are now connected by a conducting wire. A long time after this is done the charges on S1 and S2 are respectively :
A
4.5 $$\mu $$C on both
B
+4.5 $$\mu $$C and –4.5 $$\mu $$C
C
6 $$\mu $$C and 3 $$\mu $$C
D
3 $$\mu $$C and 6 $$\mu $$C
2
JEE Main 2020 (Online) 3rd September Morning Slot
Numerical
+4
-0
Change Language
When a long glass capillary tube of radius 0.015 cm is dipped in a liquid, the liquid rises to a height of 15 cm within it. If the contact angle between the liquid and glass to close to 0o, the surface tension of the liquid, in milliNewton m–1, is [$$\rho $$(liquid) = 900 kgm–3, g = 10 ms–2]
(Give answer in closest integer) _____.
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3
JEE Main 2020 (Online) 3rd September Morning Slot
Numerical
+4
-0
Change Language
An observer can see through a small hole on the side of a jar (radius 15 cm) at a point at height of 15 cm from the bottom (see figure). The hole is at a height of 45 cm. When the jar is filled with a liquid up to a height of 30 cm the same observer can see the edge at the bottom of the jar. If the refractive index of the liquid is N/100, where N is an integer, the value of N is _____. JEE Main 2020 (Online) 3rd September Morning Slot Physics - Geometrical Optics Question 115 English
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4
JEE Main 2020 (Online) 3rd September Morning Slot
Numerical
+4
-0
Change Language
A person of 80 kg mass is standing on the rim of a circular platform of mass 200 kg rotating about its axis at 5 revolutions per minute (rpm). The person now starts moving towards the centre of the platform. What will be the rotational speed (in rpm) of the platform when the person reaches its centre _________.
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