1
JEE Main 2020 (Online) 6th September Morning Slot
MCQ (Single Correct Answer)
+4
-1
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A particle of charge q and mass m is moving with a velocity $$ - v\widehat i$$ (v $$ \ne $$ 0) towards a large screen placed in the Y - Z plane at a distance d. If there is a magnetic field $$\overrightarrow B = {B_0}\widehat k$$ , the maximum value of v for which the particle will not hit the screen is :
A
$${{2qd{B_0}} \over m}$$
B
$${{qd{B_0}} \over {3m}}$$
C
$${{qd{B_0}} \over {2m}}$$
D
$${{qd{B_0}} \over {m}}$$
2
JEE Main 2020 (Online) 6th September Morning Slot
Numerical
+4
-0
Change Language
The density of a solid metal sphere is determined by measuring its mass and its diameter. The maximum error in the density of the sphere is $$\left( {{x \over {100}}} \right)$$ %. If the relative errors in measuring the mass and the diameter are 6.0% and 1.5% respectively, the value of x is_______.
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3
JEE Main 2020 (Online) 6th September Morning Slot
Numerical
+4
-0
Change Language
Initially a gas of diatomic molecules is contained in a cylinder of volume V1 at a pressure P1 and temperature 250 K. Assuming that 25% of the molecules get dissociated causing a change in number of moles. The pressure of the resulting gas at temperature 2000 K, when contained in a volume 2V1 is given by P2 . The ratio $${{{P_2}} \over {{P_1}}}$$ is ________.
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4
JEE Main 2020 (Online) 6th September Morning Slot
Numerical
+4
-0
Change Language
A part of a complete circuit is shown in the figure. At some instant, the value of current I is 1A and it is decreasing at a rate
of 102 A s–1. The value of the potential difference VP – VQ , (in volts) at that instant, is _________.

JEE Main 2020 (Online) 6th September Morning Slot Physics - Electromagnetic Induction Question 68 English
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