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Two identical capacitors each of capacitance `5 muF` are charged to potentials `2 kV and 1 kV`, respectively and their negative ends are connected together. When the positive ends are also connected together, the loss of energy of the system

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

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Proton in an Electric Field Potential difference `(DeltaV)` between two points `A and B` separated by a distance `x`, in a uniform electric field `E` is given by `DeltaV =-Ex`, where `x` is measured parallel to the field lines. If a charge `q_0` moves from A to B, the change in potential energy `(DeltaU)` is given as `DeltaU=q_0 DeltaV`. A proton is released from rest in uniform electric field of magnitude `8.0 xx 10^4 Vm^(-1)` directed along the positive X-axis. The proton undergoes a displacement of 0.50 m in the direction of E.Mass of a proton `= 1.66 xx 10^(-27)

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

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How many electrons pass through a lamp in 1 min, if the current is `300 mA`? Given, the charge on an electron is `1.6 xx 10^(-19)

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

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The drift velocity of the electrons in a copper wire of length 2 m under the application of a potential difference of `220 V` is `0.5 ms^(-1)`. Their mobility (in `m^2 V^(-1)

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

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Assertion: Two infinitely long wires A and B carry unequal currents in inward direction.Then, there is only one point (excluding the points at infinity), where net magnetic field is zero.Reason: That point lies between points A and

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

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(i) A point object O is kept in a medium of refractive index in front of a convex spherical surface of radius of curvature R which separates the second medium of refractive index `n_2` from the first one, as shown in the figure.Draw the ray diagram showing the image formation and deduce the relationship between the object distance and the image distance in terms of `n_1 , n_2 and R`.(ii) When the image formed above acts as a virtual object for a concave spherical surface separating the medium `n_2` from `n_1(n_2 > n_1)` , draw this ray diagram and write

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

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What is the effect on the interference fringes in a Young’s double-slit experiment due to: the monochromatic source is replaced by a source of white light?(In each operation, take all parameters, other than the one specified, to remain

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

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(i) AJse Huygens' geometrical construction to show how a plane wavefront at t = 0 .propagates and produces a wavefront at a later time.(ii) Verify, using Huygens' principle, Snell's law of refraction of a plane wave propagating from a denser to a rarer medium.(iii) When monochromatic light is incident on a surface separation two media, the reflected and refracted light both have the same frequency. Explain

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

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An electron and an alpha particle have the same debroglie wavelength associated with them? How are their kinetic energies related to each

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A short electric dipole of dipole moment `vecp` is placed at a distance r from the centre of a solid metallic sphere of radius a

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

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When a piece of polythene is rubbed with wool, a charge of `–2×10^(–7) C` is developed on polythene. What is the amount of mass, which is transferred to

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A short electric dipole is situated at the origin of coordinate axis with its axis along x–axis and equator along y–axis. It is found that the magnitudes of the electric intensity and electric potential due to the dipole are equal at a point distant `r=sqrt5 m` from origin. Find the position vector of the point in first

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

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The expression which shows how and which of the base quantities represent the dimensions of a physical quantity is called the dimensional formula of the given physical quantity. The recognition of concepts of dimensions, which guide the description of physical behaviour is of basic importance as only those physical quantities can be added or subtracted which have the same dimensions. A thorough understanding of dimensional analysis helps us in deducing certain relations among different physical quantities and checking the derivation, accuracy and dimensional consistency or homogeneity of various mathematical expressions. When magnitudes of two or more physical quantities are multiplied,

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

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12th NCERT Chapter1 intro

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The line that draws power supply to your house from street

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A line charge `lambda` per unit length is pasted uniformly onto the rim of a wheel of mass m and radius R. The wheel has light non–conducting spokes and is free to rotate about a vertical axis as shown in figure.A uniform magnetic field B exist as shown in figure. What is the angular velocity of the wheel when the field is suddenly switched off?Consider a conducting circular loop placed in a magnetic field as shown in figure. When magnetic field changes with time, magnetic flux also changes and emf `e=-(dphi)/(dt)` is induced. If resistance of loop is R then

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

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A magnetic field set up using Helmholtz coils (described in Exercise 4.16) is uniform in a small region and has a magnitude of 0.75 T. In the same region, a uniform electrostatic field is maintained in a direction normal to the common axis of the coils. A narrow beam of (single species) charged particles all accelerated through 15 kV enters this region in a direction perpendicular to both the axis of the coils and the electrostatic field. If the beam remains undeflected when the electrostatic field is 9.0 × 10–5 V m–1, make a simple guess as to what the

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

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Two identical looking iron bars A and B are given, one of which is definitely known to be magnetised. (We do not know which one.) How would one ascertain whether or not both are magnetised? If only one is magnetised, how does one ascertain which one? [Use nothing else

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

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Two point charges `+8 q and -2q` are located at `x=0 and x=L`, respectively. The location of a point on the X-axis at which the net electric field due to these two point charges is zero,

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

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Two plates each having an area A are kept parallel to each other at a short distance `d`. They carry charges `+Q and -Q` respectively. The electric field in the space between the plates will

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

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