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6 months ago

Physics physics ncert exemplar solutions class 12th chapter two

The dimension of mutual inductance is:

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Vishal Baghel

Contributor-Level 10

$e = - M \frac{d i}{d t}$

$M = \frac{e}{d i / d t} = M L^{2} T^{- 2} A^{- 2}$

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New answer posted

6 months ago

Physics Ray Optics and Optical Instruments

The efficiency of a Carnot's engine, working between stem point and ice point, will be

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Payal Gupta

Contributor-Level 10

Steam point (T₁) = 100°C = 273 + 100 = 373 K

Ice point (T₂) = 0°C = 273 K

$η = (1 - \frac{T_{2}}{T_{1}}) * 100 = (1 - \frac{273}{373}) * 100 = 26.81 %$

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6 months ago

Physics Semiconductor Electronics

The variation of acceleration due to gravity (g) with distance (r) from the centre of the earth is correctly represented by: (Given R = radius of earth)

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Payal Gupta

Contributor-Level 10

$g \propto r 0 \leq r \leq R$

$g \propto \frac{1}{r^{2}} r > R$

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6 months ago

Physics Semiconductor Electronics

The variation of acceleration due to gravity (g) with distance (r) from the centre of the earth is correctly represented by: (Given R = radius of earth)

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New answer posted

6 months ago

Physics Laws of Motion

A thin circular ring of mass M and radius R is rotating with a constant angular velocity 2 rads^-1 in a horizontal plane about an axis vertical to its plane and passing through the centre of the ring. If two objects each of mass m be attached gently to the opposite ends of a diameter of ring, the will then rotate with an angular velocity (in rads^-1).

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Payal Gupta

Contributor-Level 10

By conservation of Angular momentum

L_i = L_f

$M R^{2} ω = (m R^{2} + 2 m R^{2}) ω'$

$\frac{2 M}{M + 2 m} = ω'$

$\Rightarrow$ $ω' = \frac{2 M}{M + 2 m}$

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6 months ago

Physics System of Particles and Rotational Motion

An object is thrown vertically upwards. At its maximum height, which of the following quantity becomes zero?

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Payal Gupta

Contributor-Level 10

At maximum height velocity (v) = 0

So, momentum = mv = m * 0 = 0

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6 months ago

Physics Electrostatic Potential and Capacitance

A person is standing in an elevator. In which situation, he experiences weight loss?

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Payal Gupta

Contributor-Level 10

F.B.D of person w.r.t. elevator

mg – N = ma

N = mg – ma

N decreases so, person experiences weight loss.

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6 months ago

Physics Electromagnetic Waves

An expression for a dimensionless quantity P is given by $P = \frac{α}{β} l o g_{e} (\frac{k t}{β t});$ where α and β are constants, x is distance; k is Boltzmann constant and t is the temperature. Then the dimensions of will be

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Payal Gupta

Contributor-Level 10

$P = \frac{α}{β} l o g_{e} (\frac{k t}{β x})$

$\frac{k t}{β x}$ = Dimensionless

$β = \frac{k t}{x} = \frac{[M L^{2} T^{- 2} k^{- 1}] [k]}{[L]}$

$\frac{α}{β} =$ dimensionless

= dimensionless of

= MLT²

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6 months ago

Physics The p-Block Elements

Production of iron in blast furnace follows the following equation

$F e_{3} O_{4} (s) + 4 C O (g) \to 3 F e (I) + 4 C O_{2} (g)$

When 4.640 kg of Fe₃O₄ and 2.520 kg of CO are allowed to react then the amount of iron (in g) produced is:

[Given : Molar Atomic mass (g mo^-1); Fe = 56

Molar Atomic mass (g mol^-1); O = 16

Molar Atomic mass (g mol^-1); C = 12]

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alok kumar singh

Contributor-Level 10

Moles of Fe₃O₄ = $\frac{4.64 * 1 0^{3}}{232} = 20$

Moles of CO = $\frac{2.52 * 1 0^{3}}{28} = 90$

So limiting reagent = Fe₃O₄

So moles of Fe formed = 60

Weight of Fe = 60 * 56 = 3360

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New answer posted

6 months ago

Physics Physics NCERT Exemplar Solutions Class 12th Chapter Thirteen

For the network shown below, the value of V_B – VA is_________ V.

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alok kumar singh

Contributor-Level 10

I= $\frac{15}{3} = 5 A$

$V_{B} + I * 1 ? 15 = v_{A}$

$v_{B} ? v_{A} = 15 ? 5 * 1$

= 10v

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