1
JEE Main 2021 (Online) 27th August Morning Shift
MCQ (Single Correct Answer)
+4
-1
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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 $$\Omega$$
2
JEE Main 2021 (Online) 27th August Morning Shift
MCQ (Single Correct Answer)
+4
-1
Change Language
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 72 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 72 English Option 1
B
JEE Main 2021 (Online) 27th August Morning Shift Physics - Simple Harmonic Motion Question 72 English Option 2
C
JEE Main 2021 (Online) 27th August Morning Shift Physics - Simple Harmonic Motion Question 72 English Option 3
D
JEE Main 2021 (Online) 27th August Morning Shift Physics - Simple Harmonic Motion Question 72 English Option 4
3
JEE Main 2021 (Online) 27th August Morning Shift
Numerical
+4
-1
Change Language
A body of mass (2M) splits into four masses (m, M $$-$$ m, m, M $$-$$ m}, which are rearranged to form a square as shown in the figure. The ratio of $${M \over m}$$ for which, the gravitational potential energy of the system becomes maximum is x : 1. The value of x is ............ .

JEE Main 2021 (Online) 27th August Morning Shift Physics - Gravitation Question 108 English
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4
JEE Main 2021 (Online) 27th August Morning Shift
Numerical
+4
-1
Change Language
The alternating current is given by $$i = \left\{ {\sqrt {42} \sin \left( {{{2\pi } \over T}t} \right) + 10} \right\}A$$

The r.m.s. value of of this current is ................. A.
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