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New answer posted

4 months ago

Physics Class 12th

A charge q of mass m enters a region of electric field E = -E₀ĵ with a velocity v₀î + v₀ĵ at origin. Find the x coordinate where the charge hits the x axis again. (Neglect effect of gravity)
0 Follower 3 Views

V
Vishal Baghel

Contributor-Level 10

In y axis u? = v? a? = -E? q / m
s? = 0, u? t + (1/2)a? t² = 0 ⇒ t = 2u? /a? = 2v? m/E? q
x coordinate at that time = v? * t = (2v? m/0) * v? = (2v? ²m)/E? q

New answer posted

4 months ago

Physics Class 11th

In free space, two particles of mass m each are initially both at rest at a distance a from each other. They start moving towards each other due to their mutual gravitational attraction. The time after which the distance between them has reduced to a/2 is
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Vishal Baghel

Contributor-Level 10

Let the origin be at the CM of the particles, let the initial positions of the particles be x = a/2 and x = -a/2 and let the instantaneous positions of the particles be x = r and x = -r
Let the instantaneous velocity of each particle be v
Let the time after which the distance between the particles has reduced to a/2 be T
Then, for the particle that was initially at x = -a/2,
(Gm²/ (2r)²) = -m (vdv/dr) ⇒ (Gm/r²) = - (4vdv/dr) ⇒ -4∫vdv = Gm∫ (dr/r²)
[v is negative because the velocity is towards the –X direction]
dr/dt = -√ (Gm/2) (1/r - 2/a)¹? ²
⇒ ∫ (a/2)^ (a/4) (r/√ (a-2r)dr = -√ (Gm/2a) ∫? dt
⇒ ∫ (a/2)^ (a/4

...more

New answer posted

4 months ago

Physics Class 12th

Abhishek and Deepak have two samples of magnetic materials X and Y. Experimentally they determine the following properties of the samples.
| | Retentivity | Coercivity |
| :--- | :--- | :--- |
| X | 1.5 T | 20 Am?¹ |
| Y | 1.0 T | 100 Am?¹ |
Considering this, choose best choice
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Vishal Baghel

Contributor-Level 10

For permanent magnetic Y is good choice, As it has very high coercivity (comparitively)

New answer posted

4 months ago

Physics Class 11th

A rod of mass m and length L is hinged at its top end. If the rod is in equilibrium making an angle of 30° with the vertical when a horizontal force F is applied as shown in figure, then the value of F is:
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Vishal Baghel

Contributor-Level 10

Taking torque at top pt, mg sin30°*L / 2 = F cos30°*L ⇒ F = mg / 2√3

New answer posted

4 months ago

Physics Thermodynamics

An ideal gas undergoes a cyclic process whose indicator diagram is as shown in the figure. Find the work done by the gas in 1 complete cycle.
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Vishal Baghel

Contributor-Level 10

Workdone by gas = area enclosed in P-V diagram
= π (2)² lt-atm

New answer posted

4 months ago

Physics Physics Ray Optics and Optical Instruments

A ray of light is reflected by two perpendicular plane mirrors as shown. The angle θ is equal to:
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Vishal Baghel

Contributor-Level 10

At second surface,
i = 25°
r = 25°
∴ θ = I + r = 50°

New answer posted

4 months ago

Physics Physics Moving Charges and Magnetism

A proton of mass m and charge q enters a region of uniform magnetic field of a magnitude B with a velocity v directed perpendicular to the magnetic field. It moves in a circular path and leaves the magnetic field after completing a quarter of a circle. The time spent by the proton inside the magnetic field is proportional to:
0 Follower 2 Views

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Vishal Baghel

Contributor-Level 10

The time spent in magnetic field (t) is independent of velocity of charge.
t = (1/4) (2πm/qB)

New answer posted

4 months ago

Physics Physics Wave Optics

If the intensity of light in double slit experiment from slit 1 and slit 2 are I0 and 25I0 respectively, find the ratio of intensities of light at minima and maxima in the interference pattern.
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Vishal Baghel

Contributor-Level 10

At minima, I = (√I? - √25I? )² = 16I?
At maxima, I = (√I? + √25I? )² = 36I?
∴ Ratio = 16/36 = 4/9

New answer posted

4 months ago

Physics Physics Motion in Straight Line

Two trains are approaching each other on the same track with velocity 100 km/h and 50 km/h. When they are at a distance of 300 km from each other, a bird starts flying from train 1 towards train 2. When the bird reaches train 2, it instantly reverses its direction and flies again towards train 1. This process continues till the bird is trapped between the trains when they collide. If the bird always travels at a constant speed 200 km/h, the total distance the bird flies is:
0 Follower 3 Views

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Vishal Baghel

Contributor-Level 10

Time taken by trains to collide = 300/150 = 2hrs
Speed of bird = 200 km/hr
Total distance travelled by bird = 200 * 2 = 400 km

New answer posted

4 months ago

Physics Class 11th

If temperature of a liquid is increased, choose the correct option regarding change in its surface tension and viscosity.
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Vishal Baghel

Contributor-Level 10

Fact. Due to decrease in intermolecular forces

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