1
JEE Main 2020 (Online) 6th September Evening Slot
MCQ (Single Correct Answer)
+4
-1
A particle moving in the xy plane experiences a velocity dependent force
$$\overrightarrow F = k\left( {{v_y}\widehat i + {v_x}\widehat j} \right)$$ , where vx and vy are the
x and y components of its velocity $$\overrightarrow v $$ . If $$\overrightarrow a $$ is the
acceleration of the particle, then
which of the following statements is true for the particle?
A
kinetic energy of particle is constant in time
B
quantity $$\overrightarrow v \times \overrightarrow a $$ is constant in time
C
quantity $$\overrightarrow v .\overrightarrow a $$ is constant in time
D
$$\overrightarrow F $$ arises due to a magnetic field
2
JEE Main 2020 (Online) 6th September Evening Slot
Numerical
+4
-0
A Young's double-slit experiment is performed using monochromatic light of wavelength $$\lambda $$. The intensity of light at a point on the screen, where the path difference is $$\lambda $$, is K units. The intensity of light at a point where the path difference is $${\lambda \over 6}$$ is given by $${{nK} \over {12}}$$, where n is an integer. The value of n is __________.
Your input ____
3
JEE Main 2020 (Online) 6th September Evening Slot
Numerical
+4
-0
The centre of mass of solid hemisphere of radius 8 cm is x from the centre of the flat surface. Then value of x is __________.
Your input ____
4
JEE Main 2020 (Online) 6th September Evening Slot
Numerical
+4
-0
Out of Syllabus
The output characteristics of a transistor is shown in the figure.
When VCE is 10V and IC = 4.0 mA, then value of $$\beta $$ac is __________. JEE Main 2020 (Online) 6th September Evening Slot Physics - Semiconductor Question 109 English
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