1
JEE Main 2023 (Online) 1st February Evening Shift
MCQ (Single Correct Answer)
+4
-1
Change Language

As shown in the figure, a long straight conductor with semicircular arc of radius $$\frac{\pi}{10}$$m is carrying current $$\mathrm{I=3A}$$. The magnitude of the magnetic field, at the center O of the arc is :

(The permeability of the vacuum $$=4\pi\times10^{-7}~\mathrm{NA}^{-2}$$)

JEE Main 2023 (Online) 1st February Evening Shift Physics - Magnetic Effect of Current Question 83 English

A
$$4\mu\mathrm{T}$$
B
$$3\mu\mathrm{T}$$
C
$$6\mu\mathrm{T}$$
D
$$1\mu\mathrm{T}$$
2
JEE Main 2023 (Online) 1st February Evening Shift
MCQ (Single Correct Answer)
+4
-1
Change Language

The threshold frequency of a metal is $$f_{0}$$. When the light of frequency $$2 f_{0}$$ is incident on the metal plate, the maximum velocity of photoelectrons is $$v_{1}$$. When the frequency of incident radiation is increased to $$5 \mathrm{f}_{0}$$, the maximum velocity of photoelectrons emitted is $$v_{2}$$. The ratio of $$v_{1}$$ to $$v_{2}$$ is :

A
$$\frac{v_{1}}{v_{2}}=\frac{1}{2}$$
B
$$\frac{v_{1}}{v_{2}}=\frac{1}{16}$$
C
$$\frac{v_{1}}{v_{2}}=\frac{1}{4}$$
D
$$\frac{v_{1}}{v_{2}}=\frac{1}{8}$$
3
JEE Main 2023 (Online) 1st February Evening Shift
MCQ (Single Correct Answer)
+4
-1
Change Language

For three low density gases A, B, C pressure versus temperature graphs are plotted while keeping them at constant volume, as shown in the figure.

JEE Main 2023 (Online) 1st February Evening Shift Physics - Heat and Thermodynamics Question 148 English

The temperature corresponding to the point '$$\mathrm{K}$$' is :

A
$$-273^{\circ} \mathrm{C}$$
B
$$-373^{\circ} \mathrm{C}$$
C
$$-100^{\circ} \mathrm{C}$$
D
$$-40^{\circ} \mathrm{C}$$
4
JEE Main 2023 (Online) 1st February Evening Shift
MCQ (Single Correct Answer)
+4
-1
Change Language

Figures (a), (b), (c) and (d) show variation of force with time.

JEE Main 2023 (Online) 1st February Evening Shift Physics - Laws of Motion Question 46 English

The impulse is highest in figure.

A
Fig (c)
B
Fig (d)
C
Fig (a)
D
Fig (b)
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