1
JEE Main 2023 (Online) 24th January Evening Shift
MCQ (Single Correct Answer)
+4
-1
Change Language

The electric potential at the centre of two concentric half rings of radii R$$_1$$ and R$$_2$$, having same linear charge density $$\lambda$$ is :

JEE Main 2023 (Online) 24th January Evening Shift Physics - Electrostatics Question 36 English

A
$$\frac{\lambda}{2\in_0}$$
B
$$\frac{\lambda}{\in_0}$$
C
$$\frac{2\lambda}{\in_0}$$
D
$$\frac{\lambda}{4\in_0}$$
2
JEE Main 2023 (Online) 24th January Evening Shift
MCQ (Single Correct Answer)
+4
-1
Change Language

Given below are two statements:

Statement I : Acceleration due to earth's gravity decreases as you go 'up' or 'down' from earth's surface.

Statement II : Acceleration due to earth's gravity is same at a height 'h' and depth 'd' from earth's surface, if h = d.

In the light of above statements, choose the most appropriate answer from the options given below

A
Statement I is correct but statement II is incorect
B
Both Statement I and II are correct
C
Statement I is incorrect but statement II is correct
D
Both Statement I and Statement II are incorrect
3
JEE Main 2023 (Online) 24th January Evening Shift
MCQ (Single Correct Answer)
+4
-1
Change Language

A photon is emitted in transition from n = 4 to n = 1 level in hydrogen atom. The corresponding wavelength for this transition is (given, h = 4 $$\times$$ 10$$^{-15}$$ eVs) :

A
99.3 nm
B
94.1 nm
C
974 nm
D
941 nm
4
JEE Main 2023 (Online) 24th January Evening Shift
MCQ (Single Correct Answer)
+4
-1
Change Language

The frequency ($$\nu$$) of an oscillating liquid drop may depend upon radius ($$r$$) of the drop, density ($$\rho$$) of liquid and the surface tension (s) of the liquid as $$\nu=r^a\rho^b s^c$$. The values of a, b and c respectively are

A
$$\left( {{3 \over 2},{1 \over 2}, - {1 \over 2}} \right)$$
B
$$\left( { - {3 \over 2}, - {1 \over 2},{1 \over 2}} \right)$$
C
$$\left( {{3 \over 2}, - {1 \over 2},{1 \over 2}} \right)$$
D
$$\left( { - {3 \over 2},{1 \over 2},{1 \over 2}} \right)$$
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