1
JEE Main 2020 (Online) 8th January Morning Slot
MCQ (Single Correct Answer)
+4
-1
Change Language
At time t = 0 magnetic field of 1000 Gauss is passing perpendicularly through the area defined by the closed loop shown in the figure. If the magnetic field reduces linearly to 500 Gauss, in the next 5s, then induced EMF in the loop is : JEE Main 2020 (Online) 8th January Morning Slot Physics - Electromagnetic Induction Question 77 English
A
48 μV
B
28 μV
C
56 μV
D
36 μV
2
JEE Main 2020 (Online) 8th January Morning Slot
MCQ (Single Correct Answer)
+4
-1
Change Language
A particle of mass m is fixed to one end of a light spring having force constant k and unstretched length $$\ell $$. The other end is fixed. The system is given an angular speed $$\omega $$ about the fixed end of the spring such that it rotates in a circle in gravity free space. Then the stretch in the spring is :
A
$${{m\ell {\omega ^2}} \over {k - m{\omega ^2}}}$$
B
$${{m\ell {\omega ^2}} \over {k - m{\omega}}}$$
C
$${{m\ell {\omega ^2}} \over {k + m{\omega ^2}}}$$
D
$${{m\ell {\omega ^2}} \over {k + m{\omega}}}$$
3
JEE Main 2020 (Online) 8th January Morning Slot
MCQ (Single Correct Answer)
+4
-1
Change Language
Three charged particle A, B and C with charges –4q, 2q and –2q are present on the circumference of a circle of radius d. the charged particles A, C and centre O of the circle formed an equilateral triangle as shown in figure. Electric field at O along x-direction is : JEE Main 2020 (Online) 8th January Morning Slot Physics - Electrostatics Question 130 English
A
$${3{\sqrt 3 q} \over 4{\pi {\varepsilon _0}{d^2}}}$$
B
$${{\sqrt 3 q} \over 4{\pi {\varepsilon _0}{d^2}}}$$
C
$${{\sqrt 3 q} \over {\pi {\varepsilon _0}{d^2}}}$$
D
$${{2\sqrt 3 q} \over {\pi {\varepsilon _0}{d^2}}}$$
4
JEE Main 2020 (Online) 8th January Morning Slot
MCQ (Single Correct Answer)
+4
-1
Change Language
The graph which depicts the results of Rutherford gold foil experiment with $$\alpha $$-particales is :
$$\theta $$ : Scattering angle
Y : Number of scattered $$\alpha $$-particles detected (Plots are schematic and not to scale)
A
JEE Main 2020 (Online) 8th January Morning Slot Physics - Atoms and Nuclei Question 152 English Option 1
B
JEE Main 2020 (Online) 8th January Morning Slot Physics - Atoms and Nuclei Question 152 English Option 2
C
JEE Main 2020 (Online) 8th January Morning Slot Physics - Atoms and Nuclei Question 152 English Option 3
D
JEE Main 2020 (Online) 8th January Morning Slot Physics - Atoms and Nuclei Question 152 English Option 4
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