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Physics Ncert Solutions Class 12th

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Physics Ncert Solutions Class 12th Class 12th

A solid metal sphere of radius R having charge q is enclosed inside the concentric spherical shell of inner radius a and outer radius b as shown in figure. The approximate variation electric field $\vec{E}$ as a function of distance r from centre O is given by:

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Vishal Baghel

Contributor-Level 10

Assuming shell to be conducting

For $\frac{0 \leq r < R}{q_{i n} = 0},$

E = 0

$\frac{R \leq r < a}{q_{i n} = Q}$

$E = \frac{k Q}{r^{2}}$

$\frac{a \leq r < b}{q_{i n} = Q - Q = 0}$

E = 0

$\frac{r \geq b}{q_{i n} = Q}$

$E = \frac{k Q}{r^{2}}$

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Physics Ncert Solutions Class 12th Communication Systems

A signal of 100 THz frequency can be transmitted with maximum efficiency by:

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Vishal Baghel

Contributor-Level 10

Optical fibre frequency range is 1 THz to 1000 THz.

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Physics Ncert Solutions Class 12th Class 12th

The photodiode is used to detect the optical signals. These diodes are preferably operated in reverse biased mode because:

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Vishal Baghel

Contributor-Level 10

Very small change in minority charge carriers produces high value of reverse bias current.

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Physics Ncert Solutions Class 12th Class 12th

A logic gate circuit has two inputs A and B and output Y. The voltage waveforms of A, B and Y are shown below. The logic gate circuit is:

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alok kumar singh

Contributor-Level 10

Y ->And gate

A	B	Y
0	0	0
1	1	1
0	1	0
1	0	0

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Physics Ncert Solutions Class 12th Class 12th

Two identical positive charge Q each are fixed at a distance of '2a' apart from each other. Another point charge q₀ with mass 'm' is placed at midpoint between two fixed charges. For a small displacement along the line joining the fixed charges, the charge q₀ executes SHM. The time period of oscillation of charge q₀ will be:

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alok kumar singh

Contributor-Level 10

$F_{R} = {\frac{k Q q_{0}}{{(a - x)}^{2}} - \frac{k Q q_{0}}{{(a + x)}^{2}}}$

$= - k Q q_{0} {\frac{a^{2} + x^{2} + 2 a x - a^{2} - x^{2} + 2 a x}{(a^{2} - x^{2})}}$

$F_{R} = - \frac{k Q q_{0} (4 a x)}{{(a^{2} - x^{2})}^{2}}$

$T = 2 π \sqrt[]{\frac{a^{3} m}{4 k Q q_{0}} = \sqrt[]{\frac{4 π^{2} a^{3} m * 4 π ε_{0}}{4 Q q_{0}}}} = \sqrt[]{\frac{4 π^{3} ε_{0} m a^{3}}{Q q_{0}}}$ .

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Physics Ncert Solutions Class 12th Class 12th

In an experiment of CE configuration of n-p-n transistor, the transfer characteristics are observed as given in figure.

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alok kumar singh

Contributor-Level 10

Voltage gain = $\frac{I_{C} R_{0}}{I_{B} R_{i}}$

R₀ ->Output Resistance

R_i ->Input Resistance

I_C ->Collector current

I_{B ->}Base current

Voltage gain = $\frac{I_{C}}{I_{B}} \frac{R_{0}}{R_{i}} = \frac{(5 * 1 0^{- 3})}{(100 * 1 0^{- 6})} * \frac{60}{200} = 15$

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Physics Ncert Solutions Class 12th Class 12th

Match List I with List II

List II List II

A. Facsimile I. Static Document Image

B. Guided media Channel II. Local Broadcast Radio

C. Frequency Modulation

...more

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alok kumar singh

Contributor-Level 10

Kindly go through the solution

Based on theory

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Physics Ncert Solutions Class 12th Class 12th

Identify the logic operation performed by the given circuit:

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alok kumar singh

Contributor-Level 10

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Physics Ncert Solutions Class 12th Class 12th

A long solenoid carrying a current produces a magnetic field B along its axis. If the current is doubled and the number of turns per cm is halved, the new value of magnetic field will be equal to

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alok kumar singh

Contributor-Level 10

$B = η μ_{0} l$

if l ->2l

$η \to \frac{n}{2}$

$B^{1} = \frac{n}{2} μ_{0} 2 l$

$B^{1} = B$

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Physics Ncert Solutions Class 12th Class 12th

An unpolarised light beam of intensity 2l₀ is passed through a polaroid P and then through another polaroid Q which is oriented is such a way that its passing axis makes an angle of 30° relative to that of P. The intensity of the emergent light is

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Payal Gupta

Contributor-Level 10

$I = I_{0} c o s^{2} 30 °$

$= I_{0} {(\frac{\sqrt[]{3}}{2})}^{2} = \frac{3}{4} I_{0}$

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