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1

JEE Main 2025 (Online) 28th January Evening Shift

MCQ (Single Correct Answer)

+4

-1

A balloon and its content having mass M is moving up with an acceleration ‘a’. The mass that must be released from the content so that the balloon starts moving up with an acceleration ‘3a’ will be

(Take ‘g’ as acceleration due to gravity)

A

$ \frac{3Ma}{2a + g} $

B

$ \frac{2Ma}{3a + g} $

C

$ \frac{3Ma}{2a - g} $

D

$ \frac{2Ma}{3a - g} $

2

JEE Main 2025 (Online) 28th January Evening Shift

MCQ (Single Correct Answer)

+4

-1

The ratio of vapour densities of two gases at the same temperature is $ \frac{4}{25} $, then the ratio of r.m.s. velocities will be :

A

$ \frac{5}{2} $

B

$ \frac{25}{4} $

C

$ \frac{4}{25} $

D

$ \frac{2}{5} $

3

JEE Main 2025 (Online) 28th January Evening Shift

MCQ (Single Correct Answer)

+4

-1

JEE Main 2025 (Online) 28th January Evening Shift Physics - Magnetic Effect of Current Question 40 English

An infinite wire has a circular bend of radius a, and carrying a current I as shown in the figure. The magnitude of magnetic field at the origin O of the arc is given by:

A

$\frac{\mu_0}{2 \pi} \frac{\mathrm{I}}{\mathrm{a}}\left[\frac{\pi}{2}+2\right]$

B

$\frac{\mu_0}{4 \pi} \frac{\mathrm{I}}{\mathrm{a}}\left[\frac{3 \pi}{2}+1\right]$

C

$\frac{\mu_0}{4 \pi} \frac{\mathrm{I}}{\mathrm{a}}\left[\frac{\pi}{2}+1\right]$

D

$\frac{\mu_0}{4 \pi} \frac{\mathrm{I}}{\mathrm{a}}\left[\frac{3 \pi}{2}+2\right]$

4

JEE Main 2025 (Online) 28th January Evening Shift

MCQ (Single Correct Answer)

+4

-1

The frequency of revolution of the electron in Bohr's orbit varies with n, the principal quantum number as:

A

$ \frac{1}{n^4} $

B

$ \frac{1}{n^2} $

C

$ \frac{1}{n^3} $

D

$ \frac{1}{n} $

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