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A device ‘X’ is connected to an a.c source. The variation of voltage, current and power in one complete cycle is shown in Fig . Which curve shows power consumption over a full

asked Mar 20, 2022 in 12th Physics by varun (6.7k points)

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The electric potential of earth is taken to be zero, because earth is a

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The temperature coefficient of resistance of an alloy used for making resistors

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The optical properties of a medium are governed by the relative permitivity (`ε_r`) and relative permeability (`μ_r` ). The refractive index is defined as `sqrt(μ_rε_r) = n` .For ordinary material `ε_r` > 0 and `μ_r` > 0 and the positive sign is taken for the square root. In 1964, a Russian scientist V. Veselago postulated the existence of material with `ε_r` < 0 and `μ_r` < 0. Since then such ‘metamaterials’ have been produced in the laboratories and their optical properties studied. For such materials `n = -sqrt(μ εr r)` . As light enters a medium of such refractive

asked Mar 20, 2022 in 12th Physics by varun (6.7k points)

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Three charges `Q, + q and + q` are placed at the verticles of a right-angled triangle as shown. The net electrostatic energy of the configuration is zero if Q is equal to

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A particle is situated at `x = 3` units at `t = 0`. It starts moving from rest with a constant acceleration of `4 ms^(-2)`. The position of the particle at `t = 3 s`

asked Mar 19, 2022 in 11th Physics by varun (6.7k points)

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Three equal masses of m kg each are fixed at the vertices of an equilateral triangle ABC. (a) What is the force acting on a mass 2m placed at the centroid G of the triangle? (b) What is the force if the mass at the vertex A is doubled ? Take AG = BG = CG = 1m (see Fig. )

asked Mar 19, 2022 in 11th Physics by varun (6.7k points)

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Which among the curves shown in Fig. cannot possibly represent electrostatic field lines?

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The Electric flux through the

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Total charge –Q is uniformly spread along length of a ring of radius R. A small test charge +q of mass m is kept at the centre of the ring and is given a gentle push along the axis of the ring. (i) Show that the particle executes a simple harmonic oscillation.(ii) Obtain its time

asked Mar 20, 2022 in 12th Physics by varun (6.7k points)

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If a LC circuit is considered analogous to a harmonically oscillating spring block system, which energy of the LC circuit would be analogous to potential energy and which one analogous to kinetic

asked Mar 20, 2022 in 12th Physics by varun (6.7k points)

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In the LCR circuit shown in Fig , the ac driving voltage is `v = V_m sin ωt`. At t = t0, the voltage source stops and R is short circuited. Now write down how much energy is stored in each of L and

asked Mar 20, 2022 in 12th Physics by varun (6.7k points)

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A thin semicircular conducting ring of radius R is falling in a magnetic field B. Which is in limited area as shown in figure. At the position MNQ,the speed of ring is `v` and the potential difference developed across the ring

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Two identical magnets moving towards a coil, connecting a condenser at rear side shown in fig., with equal speed from opposite sides

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A resistor `30_Omega` , inductor of reactance `10_Omega` and the capacitor of reactance `10_Omega` are connected in series to an ac voltage source `e = 300sqrt 2 sin(ωt)` The current in the circuit

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If `E=20 sin (100pit)` volt then calculate value of E at `t=1/600

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If the magnetic field is parallel to the positive y-axis and the charged particle is moving along the positive x-axis (Fig. ), which way would the Lorentz force be for a proton (positive

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A charge Q is uniformly distributed over the surface of non-conducting disc of radius R. The disc rotates about an axis perpendicular to its plane and passing tarough its centre with an angular velocity co. As a result of this rotation a magnetic field of induction B is obtained at the centre of the disc. If we keep both the amount of charge placed on the disc and its angular velocity to be constant and vary the radius of the disc then the variation of the magnetic induction at the centre of the disc will be represented by the

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Suppose a system of two charges as shown below placed in an external electric field`E =A(1/r^2)`, where `A=9 xx 10^5 C'/'m^2`What would be the electrostatic energy of the

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Answer the following questions: As you have learnt in the text, the principle of linear superposition of wave displacement is basic to understanding intensity distributions in diffraction and interference patterns. What is the justification of this

asked Mar 20, 2022 in 12th Physics by varun (6.7k points)

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