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10 months ago

Physics Class 11th

A Wheatstone bridge is used to determine the value of unknown resistance X by adjusting the variable resistance Y as shown in the figure. For the most precise measurement of X, the resistance P and Q

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Raj Pandey

Contributor-Level 9

Resistance of P & Q should be approximately equal as it decreases error in experiment.

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10 months ago

Physics Class 12th

A ball is projected with a velocity, $10 {m s}^{- 1}$ , at an angle of $60^{?}$ with the vertical direction, its speed at the highest pint of its trajectory will be :

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Raj Pandey

Contributor-Level 9

At the highest point only horizontal component of velocity remains $\Rightarrow u_{x} = u c o s ? θ$

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10 months ago

Physics Work, Energy and Power

A particle is released from height $S$ from the surface of the Earth. At a certain height its kinetic energy is three times its potential energy. The height from the surface of earth and the speed of the particle at that instant are respectively:

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alok kumar singh

Contributor-Level 10

$U + K E = E$

$4 U = E = m g S$

$4 m g h = m g S$

$h = \frac{S}{4}$

$v = \sqrt[]{2 g (\frac{3 S}{4})} = \sqrt[]{\frac{3 g S}{2}}$

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10 months ago

Physics Physics Motion in Plane

A small block slides down on a smooth inclined plane, starting from rest at time $t = 0$ . Let $S_{n}$ be the distance travelled by the block in the interval $t = n - 1$ to $t = n$ . Then, the ratio $\frac{S_{n}}{S_{n + 1}}$ is:

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alok kumar singh

Contributor-Level 10

$S_{n} =$ Distance in $n^{th}$ sec. i.e. $t = n - 1$ to $t = n$

$S_{n} + 1 =$ Distance in $(n + 1)^{th}$ sec.

i.e. $t = n$ to $t = n + 1$

So as we know

$S n = \frac{a}{2} 2 n - 1 a =$ acceleration

$\frac{S_{n}}{S_{n + 1}} = \frac{\frac{a}{2} 2 n - 1}{\frac{a}{2} 2 n + 1 - 1} = \frac{2 n - 1}{2 n + 1}$

$\frac{S_{n}}{S_{n + 1}} = \frac{2 n - 1}{2 n + 1}$

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10 months ago

Physics Class 11th

Two transparent media A and B are separated by a plane boundary. The speed of light in those media are $1.5 * 10^{8} m / s$ and $2.0 * 10^{8} m / s$ , respectively. The critical angle for a ray of light for these two media is

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Raj Pandey

Contributor-Level 9

$i_{c} = {s i n}^{- 1} ? (\frac{3}{4})$

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10 months ago

Physics Class 12th

A capacitor of capacitance ' $C$ ' is connected across an ac source of voltage $V$ , given by $V = V_{0} s i n ? ω t$ The displacement current between the plates of the capacitor, would then be given by:

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alok kumar singh

Contributor-Level 10

$q = C V$

^{$\frac{d q}{d t} = \frac{C d V}{d t}$}

$I_{d} = C (V_{0} ω c o s ? ω t)$

$= V_{0} ω C o s ω t$

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10 months ago

Physics Physics Ray Optics and Optical Instruments

A convex lens ' $A$ ' of focal length $20 c m$ and a concave lens ' $B$ ' of focal length $5 c m$ are kept along the same axis with a distance ' $d$ ' between them. If a parallel beam of light falling on ' $A$ ' leaves ' $B$ ' as a parallel beam, then the distance ' $d$ ' in $c m$ will be:

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alok kumar singh

Contributor-Level 10

d = f_{1} - f_{2}

= 20 - 5

= 15 c m

(1)

q = C V

\frac{d q}{d t} = \frac{C d V}{d t}

I_{d} = C (V_{0} ω c o s ? ω t)

= V_{0} ω C o s ω t

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New answer posted

10 months ago

Physics Physics Ray Optics and Optical Instruments

A capacitor of capacitance C = 900pf is charged fully by 100 V battery B as shown in figure (a). Then it is disconnected from the battery and connected to another uncharged capacitor of capacitance C = 900pf as shown in figure (b). The electrostatic energy stored by the system (b) is :