1
JEE Main 2021 (Online) 27th August Morning Shift
MCQ (Single Correct Answer)
+4
-1
In Millikan's oil drop experiment, what is viscous force acting on an uncharged drop of radius 2.0 $$\times$$ 10$$-$$5 m and density 1.2 $$\times$$ 103 kgm$$-$$3 ? Take viscosity of liquid = 1.8 $$\times$$ 10$$-$$5 Nsm$$-$$2. (Neglect buoyancy due to air).
A
3.8 $$\times$$ 10$$-$$11 N
B
3.9 $$\times$$ 10$$-$$10 N
C
1.8 $$\times$$ 10$$-$$10 N
D
5.8 $$\times$$ 10$$-$$10 N
2
JEE Main 2021 (Online) 27th August Morning Shift
MCQ (Single Correct Answer)
+4
-1
Electric field in a plane electromagnetic wave is given by E = 50 sin(500x $$-$$ 10 $$\times$$ 1010 t) V/m The velocity of electromagnetic wave in this medium is :

(Given C = speed of light in vacuum)
A
$${3 \over 2}$$C
B
C
C
$${2 \over 3}$$C
D
$${C \over 2}$$
3
JEE Main 2021 (Online) 27th August Morning Shift
MCQ (Single Correct Answer)
+4
-1
Five identical cells each of internal resistance 1$$\Omega$$ and emf 5V are connected in series and in parallel with an external resistance 'R'. For what value of 'R', current in series and parallel combination will remain the same?
A
1 $$\Omega$$
B
25 $$\Omega$$
C
5 $$\Omega$$
D
10 $$\Omega$$
4
JEE Main 2021 (Online) 27th August Morning Shift
MCQ (Single Correct Answer)
+4
-1
The variation of displacement with time of a particle executing free simple harmonic motion is shown in the figure.

JEE Main 2021 (Online) 27th August Morning Shift Physics - Simple Harmonic Motion Question 55 English
The potential energy U(x) versus time (t) plot of the particle is correctly shown in figure :
A
JEE Main 2021 (Online) 27th August Morning Shift Physics - Simple Harmonic Motion Question 55 English Option 1
B
JEE Main 2021 (Online) 27th August Morning Shift Physics - Simple Harmonic Motion Question 55 English Option 2
C
JEE Main 2021 (Online) 27th August Morning Shift Physics - Simple Harmonic Motion Question 55 English Option 3
D
JEE Main 2021 (Online) 27th August Morning Shift Physics - Simple Harmonic Motion Question 55 English Option 4
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