Physics

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

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Physics Units and Measurement

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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a year ago

Which of the following is not a dimensionless quantity?

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Contributor-Level 10

$μ_{0} = \frac{B_{0}}{H} = N A^{- 2}$

$[μ_{0}] = [M^{1} L^{1} T^{- 2} A^{- 2}]$

It is not dimensionless

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a year ago

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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Physics System of Particles and Rotational Motion

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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a year ago

Moment of inertial of a square plate of side/ about the axis passing through one of the corner and perpendicular to the plane of square plate is given by:

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Contributor-Level 10

$l_{z} = l_{x} + l_{y}$

$l_{z} = \frac{m l^{2}}{3} + \frac{m l^{2}}{3} = \frac{2}{3} m l^{2}$

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a year ago

Physics Motion in a Plane

A huge circular arc of length 4.4 ly subtends an angle '4s' at the centre of the circle. How long it would take for a body to complete 4 revolution of its speed is 8 AU per second?

Given : 1 ly = 9.46 * 10¹⁵m

1 AU = 1.5 * 10¹¹m

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Contributor-Level 10

$R = \frac{l}{θ}$

$\Rightarrow T i m e = \frac{4 * 2 π R}{V} = \frac{4 * 2 π x}{V} (\frac{l}{θ})$

Time $= \frac{4 * 2 π * 4.4 * 9.64 * 1 0^{15}}{8 * 1.5 * 1 0^{11} * \frac{4}{3600} * \frac{π}{180}}$

$\Rightarrow T i m e = 4.5 * 1 0^{10} s o c s$

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a year ago

The colour coding on a carbon resistor is shown in the given figure. The resistance value of the given resistor is:

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Contributor-Level 10

$R = 75 * 1 0^{2} \pm 5 %$

$\Rightarrow R = 7500 \pm 375 Ω$

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a year ago

In Millikan's oil drop experiment, what is viscous force acting on an uncharged drop of radius 2.0 * 10^-⁵m and density 1.2 * 10³ kgm^-³? Take viscosity of liquid = 1.8 * 10^-⁵ Nsm^-². (Neglect buoyancy due to air).

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Contributor-Level 10

Viscous force = Weight

$\Rightarrow F_{V} = ρ * \frac{4}{3} π r^{3} * g = 3.9 * 10 N^{- 10}$

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a year ago

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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Contributor-Level 10

Kindly go through the solution

$λ > h \Rightarrow λ > 400 m$

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a year ago

Five identical cells each of internal resistance $1 Ω$ and emf 5V are connected in series and in parallel with an external resistance 'R'. For what value of 'R', current in series and parallel combination will remain the same?

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Contributor-Level 10

$l_{1} = \frac{25}{5 + R}$

$l_{2} = \frac{5}{R + \frac{1}{5}}$

$\begin{array}{l} ? l_{1} = l_{2} \Rightarrow 4 R = 4 \\ \Rightarrow R = 1 Ω \end{array}$

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a year ago

Three capacitors C₁ = $2 μ F, C_{2} = 12 μ F$ and C₃ = $12 μ F$ are connected as shown in figure. Find the ratio of the charges on capacitors C₁, C₂ and C₃ respectively:

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