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Find charge on each spherical shell after joining the inner most shell and 1 outer most shell by a conducting wire. Also find charges on each

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

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Two conducting hollow spherical shells of radii `R and 2R` carry charges – Q and 3Q`` respectively. How much charge will flow into the earth if inner shell is grounded

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

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An isolated conducting sphere of charge Q and radius R is connected to a similar uncharged sphere (kept at a large distance) by using a high resistance wire. After a long time what is the amount of heat loss

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

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A simple pendulum is suspended in a lift which is going up with an acceleration of `5 m'/'s^2` . An electric field of magnitude 5 N/C and directed vertically upward is also present in the lift . The charge of the bob is `1 muC` and mass is 1 mg . Taking `g=pi^2` and length of the simple pendulum 1m, find the time period of the simple pendulum (in

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

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The variation of potential with distance x from a fixed point is shown in figure. Find the magnitude of the electric field (in `V'/'m`) at `x

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

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The energy density u is plotted against the distance r from the centre of a spherical charge distribution on a log-log scale. Find the magnitude of slope of obtianed straight

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

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The figure shows four situations in which charges as indicated `(q > 0)` are fixed on an axis. How many situations is there a point to the left of the charges where an electron would be in

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

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An electric field is given by `vecE=(yhati+xhatj)N/C`. Find the work done (in J) in moving a 1C charge from `vecr_A=(2hati+2hatj)m` to

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

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The arrangement shown consists of three elements. (i) A thin rod of charge `–3.0 muC` that forms a full circle of radius 6.0 cm. (ii) A second thin rod of charge `2.0 muC` that forms a circular arc of radius 4.0 cm and concentric with the full circle, subtending an angle of 90° at the centre of the full circle. (iii) An electric dipole with a dipole moment that is perpendicular to a radial line and has magnitude `1.28 × 10^(–21)C-m.` Find the net electric potential in volts at the

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

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Six charges are kept at the vertices of a regular hexagon as shown in the figure. If magnitude of force applied by +Q on +q charge is F, then net electric force on the +Q is nF. Find the value of n.

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

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Electric field in a region is given by `vecE=-4xhati+6yhatj`. The charge enclosed in the cube of side 1m oriented as shown in the diagram is given by `alphaepsilon_0` . Find the value of

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

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An infinite plane of charge with `sigma=2epsilon_0''C/ m^2`is tilted at a 37° angle to the vertical direction as shown below. Find the potential difference, `V_A–V_B` in volts, between points A and B at 5 m distance apart. (where B is vertically above

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

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Some of the most profound statements on the nature of science have come from Albert Einstein, one of the greatest scientists of all time. What do you think did Einstein mean when he said : “The most incomprehensible thing about the world is that it is

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

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“Every great physical theory starts as a heresy and ends as a dogma”. Give some examples from the history of science of the validity of this incisive

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

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“Politics is the art of the possible”. Similarly, “Science is the art of the soluble”. Explain this beautiful aphorism on the nature and practice of

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

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Though India now has a large base in science and technology, which is fast expanding, it is still a long way from realising its potential of becoming a world leader in science. Name some important factors, which in your view have hindered the advancement of science in

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

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No physicist has ever “seen” an electron. Yet, all physicists believe in the existence of electrons. An intelligent but superstitious man advances this analogy to argue that ‘ghosts’ exist even though no one has ‘seen’ one. How will you refute his argument

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

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The shells of crabs found around a particular coastal location in Japan seem mostly to resemble the legendary face of a Samurai. Given below are two explanations of this observed fact. Which of these strikes you as a scientific explanation ? (a) A tragic sea accident several centuries ago drowned a young Samurai. As a tribute to his bravery, nature through its inscrutable ways immortalised his face by imprinting it on the crab shells in that area. (b) After the sea tragedy, fishermen in that area, in a gesture of honour to their dead hero, let free any crab shell

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

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The industrial revolution in England and Western Europe more than two centuries ago was triggered by some key scientific and technological advances. What were these advances

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

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It is often said that the world is witnessing now a second industrial revolution, which will transform the society as radically as did the first. List some key contemporary areas of science and technology, which are responsible for this

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

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