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Physics Ncert Solutions Class 12th

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Physics Ncert Solutions Class 12th Class 12th

A capacitor of 50 $μ F$ is connected in a circuit as shown in figure. The charge on the upper plate of the capacitor is__________ $μ C .$

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Raj Pandey

Contributor-Level 9

Q = CV

$= (50 μ F) * 2 V$

$= 100 * 1 0^{- 6} C$

$Q = 100 μ C \to$ (on upper plate)

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Physics Ncert Solutions Class 12th Class 12th

The voltage drop across $15 Ω$ resistance in the given figure will be_______V.

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Raj Pandey

Contributor-Level 9

$R_{e q} = 6 ?$

$∴ i = \frac{12 v}{6 Ω} \Rightarrow 2 A$ (through battery)

$∴ v_{15 Ω} = 6 V$

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Physics Ncert Solutions Class 12th Class 12th

The voltage drop across $15 Ω$ resistance in the given figure will be_______V.

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Physics Ncert Solutions Class 12th Communication Systems

A transmitting antenna has a height of 320 m and that of receiving antenna is 2000m. The maximum distance between them for satisfactory communication in line of sight mode is 'd'. The value of 'd' is……….km.

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Vishal Baghel

Contributor-Level 10

$d = \sqrt[]{2 R h_{T}} + \sqrt[]{2 R h_{R}}$

$\Rightarrow d m = (\sqrt[]{2 * 6400 * 1 0^{3} * 320} + \sqrt[]{2 * 6400 * 1 0^{3} * 2000})$

= 224 km

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Physics Ncert Solutions Class 12th Class 12th

For a transistor a and b are given as $α = \frac{I_{C}}{I_{E}} a n d β = \frac{I_{C}}{I_{B}} .$ Then the correct relation between a and b will be:

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alok kumar singh

Contributor-Level 10

β $= \frac{I_{C}}{I_{E}} = \frac{I_{C}}{I_{E} - I_{C}} = \frac{I_{C} / I_{E}}{1 - l_{C} / I_{E}} = \frac{α}{1 - α}$

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Physics Ncert Solutions Class 12th Class 12th

For a transistor in CE mode to be used as an amplifier, it must be operated in:

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Vishal Baghel

Contributor-Level 10

Active region of the CE transistor is linear region and is best suited for its use as an amplifier.

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Physics Ncert Solutions Class 12th Class 12th

A coaxial cable consists of an inner wire of radius 'a' surrounded by an outer shell of inner and outer radii 'b' and 'c' respectively. The inner wire carries an electric current i₀, which is distributed uniformly across cross-sectional area. The outer shell carries an equal current in opposite direction and distributed uniformly. What will be the ratio of the magnetic field at a distance x from the axis when (i) x < a and(ii) a < x < b?

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alok kumar singh

Contributor-Level 10

For x < a,

B₁ = $\frac{μ_{0} i_{0} x}{2 π a^{2}}$

For a < x < b,

$B_{2} = \frac{μ_{0} i_{0}}{2 π x}$

$\frac{B_{1}}{B_{2}} = \frac{x^{2}}{a^{2}}$

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Physics Ncert Solutions Class 12th Class 12th

An antenna is mounted on a 400m tall building. What will be the wavelength of signal that can be radiated effectively by the transmission tower upto a range of 44kg?

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