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In a H-atom, an electron moves in a circular orbit of radius `5.2xx 10^(-11)` meter and produces a mag. field of 12.56 Tesla at its nucleus. The current produced by the motion of the electron will be .................

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The given figure shows tracks of three charged particles in a uniform electrostatic field. Which particle has the highest charge to mass

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Electric Dipole An electric dipole is a pair of point charges with equal magnitude and opposite in sign separated by a very small distance. The mid-point of locations of `-q and q` is called the centre of the dipole. The strength of an electric dipole is measured by a vector quantity known as electric dipole moment `(p)` which is the product of the charge `(q)` and separation between the charges `(2l)`.In most molecules, the centres of positive charges and of negative charges lie at the same place, hence their dipole moment is zero. `e.g. CO_2, CH_4`. However, they develop a

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If charges move without collisions through the conductor, their kinetic energy would also change, so that the total energy

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Two bulbs of `40W and 60W` are connected to `220V` line, the ratio of resistance will

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What is the effect on the interference fringes in a Young’s double-slit experiment, (a) the separation between the two slits is increased(b) what should the width of each slit be to obtain 10 maxima of the double slit pattern within the central maximum of the single slit

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

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(i) A circular coil of 30 turns and radius 8.0 cm carrying a current of 6.0 A is suspended vertically in a uniform horizontal magnetic field of magnitude 1.0 T. The field lines make an angle of 60° with the normal of the coil. Calculate the magnitude of the counter torque that must be applied to prevent the coil from turning with the normal of the coil. Calculate the magnitude of the counter torque that must be applied to prevent the coil from turning.(ii) Would your answer change, if the circular coil in (a) were replaced by a planar coil

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

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Drift velocity `v_d` varies with the intensity of electric field as per the

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Gauss Law in Magnetism We can write Gauss’s law for magnetostatics as `intB.dA=mu_0m`, where, `intB •dA`. is the magnetic flux and m is the net magnetic pole strength inside a closed surface. It was found that, magnetic flux through a closed surface is always zero, thus we reach at a conclusion that magnetic monopoles do not exist. A bar magnet always attain north-south poles no matter how many times it is cut into pieces.The net magnetic flux due to a bar magnet over a closed surface

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

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A square loop is symmetrically placed between two infinitely long current carrying wires in the same direction. Magnitude of currents in both the wires are same. Now, match the Column I with Column II and select the correct answer from the codes given below Column I Column II A. Loop is moved p. Induced current towards right in the loop is clockwise. B. Loop is moved q. Induced current towards left in the loop is anti-clockwise. C. Wire-1 is r. Power in the moved towards loop is zero. left

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

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Faraday’s Laws According to the Faraday’s first law, whenever the amount of magnetic flux linked with a circuit changes, an emf is induced in it. Induced current is determined by the rate at which the magnetic flux changes.Mathematically, the magnitude of the induced emf in a circuit is equal to the rate of change of magnetic flux through the circuit.Induced emf `prop` Rate of change of magnetic fluxThe flux linked with a circuit is given by `phi=t^3+3t-7`. The graph between time (X-axis) and induced emf (Y-axis) will be

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One day Chetan's mother developed a severe stomach ache all of a sudden. She was rushed to the doctor who suggested for an immediate endoscopy test and gave an estimate of expenditure for the same. Chetan immediately contacted his class teacher and shared the information with her. The class teacher arranged for the money and rushed to the hospital. On realising that Chetan belonged to a below average income group family, even the doctor offered concession for the test fee. The test was conducted successfully. Answer the following questions based on the above information. (i) Which principle in optics is

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

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(i) (a) Draw a labelled ray diagram to show the formation of image in an astronomical telescope for a distant object. (b) Write the three distinct advantages of a reflecting type telescope over a refracting type telescope, (ii) A convex lens of focal length 10 cm is placed coaxially 5 cm away from a concave lens of focal length 10 cm. If an object is placed 30 cm in front of the convex lens. Find the position of the final image formed by the combined

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A charged rod is brought near a negatively charged pith ball electroscope. What conclusion would you draw about the charge on the rod if pith ball moves away from the rod ?

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

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Show that given equations are in SHM

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

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An electric field is uniform, and in the positive x direction for positive x, and uniform with the same magnitude but in the negative x direction for negative x. It is given that E = 200 `hati` N/C for x > 0 and E = –200` hati` N/C for x < 0. A right circular cylinder of length 20 cm and radius 5 cm has its centre at the origin and its axis along the x-axis so that one face is at x = +10 cm and the other is at x = –10 cm (Fig. ).

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A hemisphere is uniformely charged positively. The electric field at a point on a diameter away from the centre is

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

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The dimensions of an atom are of the order of an Angstrom. Thus there must be large electric fields between the protons and electrons. Why, then is the electrostatic field inside a conductor

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

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A metal plate is getting heated. It can be

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

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The magnetic flux linked with a coil, in webers, is given by the equation `phi=4t^2- 3t+ 7` . Then the magnitude of induced emf at 2 sec will be

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

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