1
JEE Main 2023 (Online) 29th January Evening Shift
MCQ (Single Correct Answer)
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-1
Change Language

A point charge $$2\times10^{-2}~\mathrm{C}$$ is moved from P to S in a uniform electric field of $$30~\mathrm{NC^{-1}}$$ directed along positive x-axis. If coordinates of P and S are (1, 2, 0) m and (0, 0, 0) m respectively, the work done by electric field will be

A
600 mJ
B
$$-1200$$ mJ
C
1200 mJ
D
$$-600$$ mJ
2
JEE Main 2023 (Online) 29th January Evening Shift
Numerical
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-1
Change Language

A particle of mass 100 g is projected at time t = 0 with a speed 20 ms$$^{-1}$$ at an angle 45$$^\circ$$ to the horizontal as given in the figure. The magnitude of the angular momentum of the particle about the starting point at time t = 2s is found to be $$\mathrm{\sqrt K~kg~m^2/s}$$. The value of K is ___________.

(Take g = 10 ms$$^{-2}$$)

JEE Main 2023 (Online) 29th January Evening Shift Physics - Rotational Motion Question 31 English

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3
JEE Main 2023 (Online) 29th January Evening Shift
Numerical
+4
-1
Change Language

In an experiment of measuring the refractive index of a glass slab using travelling microscope in physics lab, a student measures real thickness of the glass slab as 5.25 mm and apparent thickness of the glass slab as 5.00 mm. Travelling microscope has 20 divisions in one cm on main scale and 20 divisions on vernier scale is equal to 49 divisions on main scale. The estimated uncertainty in the measurement of refractive index of the slab is $$\frac{x}{10}\times10^{-3}$$, where $$x$$ is ___________

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4
JEE Main 2023 (Online) 29th January Evening Shift
Numerical
+4
-1
Out of Syllabus
Change Language

A null point is found at 200 cm in potentiometer when cell in secondary circuit is shunted by 5$$\Omega$$. When a resistance of 15$$\Omega$$ is used for shunting, null point moves to 300 cm. The internal resistance of the cell is ___________$$\Omega$$.

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