Recent questions tagged #mcq

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A particle of mass m and charge q is placed r at rest in a uniform electric field E and then released. The kinetic energy attained by the particle after moving a distance y

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

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A positive charge +Q is fixed at a point A. Another positively charged particle of mass m and charge +q is projected from a point B with velocity u as shown in the figure. The point B is at the large distance from A and at distance d from the line AC. The initial velocity is parallel to the line AC. The point C is at very large distance from A. The minimum distance (in meter) of +q from +Q during the motion is `d (1+sqrtA)`. Find the value of A. [Take `Qq= 4πε_0 mu^2d and d=(sqrt2-1)`

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

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Which of the following is a wrong

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

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A square surface of side L metres is in the plane of uur the paper. A uniform electric field `vecE ('volt' /m)`, also in the plane of the paper, is limited only to the lower half of the square surface (see figure). The electric flux in SI units associated with the surface is

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

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A thin semi-circular ring of radius r has a positive charge q distributed uniformly overit. The net electric field `vecE` at the centre O

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

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Two positive ions, each carrying a charge q, are separated by a distance d. If F is the force of repulsion between the ions, the number of electrons missing from each ion will be (e being the charge of an

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

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For a spherically symmetrical charge distribution, electric field at a distance r from the centre of sphere is `vecE=kr^7hatr`, where k is a constant. What will be the volume charge density at a distance r from the centre of sphere

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

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Two positrons `(e^+)` and two protons (p) are kept on four corners of a square of side a as shown in figure. The mass of proton is much larger than the mass of positron. Let q denotes the charge on the proton as well as the positron then the kinetic energies of one of the positrons and one of the protons respectively after a very long time will

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

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Four charges are placed at the circumference of a dial clock as shown in figure. If the clock has only hour hand, then the resultant force on a charge `q_0` placed at the centre, points in the direction which shows the time as

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

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A small electric dipole is placed at origin with its dipole moment directed along positive x-axis. The direction of electric field at point `(2, 2sqrt2,0)`

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

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Uniform electric field of magnitude 100 V/m in space is directed along the line `y= 3 + x`. Find the potential difference between point `A (3, 1) & B

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

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The diagram shows a uniformly charged hemisphere of radius R. It has volume charge density `rho`. If the electric field at a point 2R distance above its centre is E then what is the electric field at the point which is 2R below its

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

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A metallic rod of length `l` rotates at angular velocity `omega` about an axis passing through one end and perpendiuclar to the rod. If mass of electron is m and its charge is –e then the magnitude of potential difference between its two ends

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

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Consider a finite charged rod. Electric field at Point P (shown) makes an angle `theta` with horizontal dotted line then angle `theta` is

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 `–2xx 10^(-7)` is developed on polythene. The mass transferred to polythene is .....

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

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The protonic charge in 100 gm of water is ..........

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

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A copper sphere of mass 2 gm contains about `2xx 10^(22)` atoms. The charge on the nucleus of each atom is 29e. The fraction of electrons

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

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The rate of alpha partical falls on neutral spheare is `10^(12)` per second. The time in which sphere gets charged by 2µc is .........

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

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A charge Q is divided into two parts and then they are placed at a fixed distance. The force between the two charges is always maximum when the charges are

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

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Two point charges repel each other with a force of 100 N. One of the charges is increased by 10% and other is reduced by 10%. The new force of repulsion at the same distance would be ........

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

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