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3 months ago

Physics Class 12th

The force between two charged particle placed in air at separation x is F₀. Both the charged particle immerged in a medium of dielectric constant K without changing separation between two charge, then net force on one of the particle is now

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alok kumar singh

Contributor-Level 10

In air $F = \frac{1}{4 π \in_{0}} \frac{q_{1} q_{2}}{r^{2}}$

In medium $F' = \frac{1}{4 π (k \in_{0})} \frac{q_{1} q_{2}}{r^{2}}$

$F' = \frac{F_{0}}{K}$

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New answer posted

3 months ago

Physics Laws of Motion

In the system shown below, the pulley 4 string are ideal. If the acceleration of blocks is $\frac{g}{8}$ , find $\frac{m_{1}}{m_{2}}$

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alok kumar singh

Contributor-Level 10

$a = \frac{(m_{1} - m_{2}) g}{(m_{1} + m_{2})} = \frac{g}{8}$

8m₁ – 8m₂ = m₁ + m₂

7m₁ = 9m₂

$\frac{m_{1}}{m_{2}} = \frac{9}{7}$

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3 months ago

Physics Thermodynamics

8 moles of oxygen and 4 moles of nitrogen are at same temperature T and are mixed. The total internal energy is

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alok kumar singh

Contributor-Level 10

U = nC_vT

-> $U = n_{1} C_{v_{1}} T + n_{2} C_{v_{2}} T$

-> $8 * \frac{5 R}{2} * T + 4 * \frac{5 R}{2} * T$

= 30RT

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3 months ago

Physics Electromagnetic Induction

The magnetic flux through a loop varies with time as f = 5t² − 3t + 5. If the resistance of loop is 8 W, find the current through it at t = 2 s

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alok kumar singh

Contributor-Level 10

$\frac{d ?}{d t} = 10 t - 3$

at t = 2, V = 17

$i = \frac{V}{R} = \frac{17}{8} A$

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3 months ago

Physics Class 12th

Draw truth table of given gate circuit.

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alok kumar singh

Contributor-Level 10

$X = \bar{(A + \bar{B}) + (\bar{A} + B)}$

$(\bar{A + \bar{B}}) \cdot (\bar{\bar{A} + B})$

$(\bar{A} \cdot \bar{B}) \cdot (\bar{A} \cdot \bar{B})$

$(\bar{A} \cdot B) \cdot (A \cdot \bar{B}) = \bar{A} \cdot B \cdot A \cdot \bar{B} = 0$

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New answer posted

3 months ago

Physics Physics Ray Optics and Optical Instruments

Radius of curvature of equiconvex lens is 20 cm. Material of lens is having refractive index of 1.5. Find image distance from lens if an object is placed 10 cm away from the lens.

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alok kumar singh

Contributor-Level 10

$\frac{1}{f} = (μ - 1) (\frac{2}{R})$ f = 20 cm

$\frac{1}{v} - \frac{1}{u} = \frac{1}{f}$

$\frac{1}{v} + \frac{1}{10} = \frac{1}{20}$

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3 months ago

Physics Class 12th

In a photoelectric experiment, frequency f = 1.5f₀ (f₀ : threshold frequency). If the frequency of light is changed to f/2, then photocurrent becomes (intensity of light has doubled)

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alok kumar singh

Contributor-Level 10

Kindly go through the solution

Since $\frac{f}{2} < f_{0}$

->current = 0

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3 months ago

Physics Class 12th

Find average power in electric circuit if source voltage (V) = 20sin(100wt) and current in the circuit (I) = 2sin(100wt + $\frac{π}{3}$ )

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alok kumar singh

Contributor-Level 10

= IV cosf

$= \frac{20}{\sqrt[]{2}} * \frac{2}{\sqrt[]{2}} *$ cos 60°

= 10 W

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3 months ago

Physics Thermodynamics

Find the speed of sound in oxygen gas at STP.

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alok kumar singh

Contributor-Level 10

Kindly go though the solution

$v = \sqrt[]{\frac{γ R T}{M}} = 330 m / s$

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New answer posted

3 months ago

Physics Class 12th

If the current through an incandescent lamp decreases by 20%, how much change will be there in its illumination?

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alok kumar singh

Contributor-Level 10

Kindly go through the solution

p = i²R

P' = 0.64 i²R

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