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Electrical energy is transmitted over large distances at high alternating voltages. Which of the following statements is (are)

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In the figure the magnetic energy stored in the coil

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The core of a transformer is laminated so

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Calculate impedance of the given circuit :

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A straight wire of mass 200 g and length 1.5 m carries a current of 2 A. It is suspended in mid-air by a uniform horizontal magnetic field B (Fig.). What is the magnitude of the magnetic

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A galvanometer coil has a resistance of 12 Ω and the metre shows full scale deflection for a current of 3 mA. How will you convert the metre into a voltmeter of range 0 to 18

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

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A long straight wire carrying current of 30 Amp is placed in an external uniform mag. field of induction `4xx 10^(-4)` tesla. The mag. field is acting parallel to the directon of current. The magnitude of the resultant magnetic induction in tesla at a point 2 cm away from the wire is .........................

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

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A charge `Q` is placed at the origin. The electric potential due to this charge at a given point in space is `V`. The work done by an external force in bringing another charge `q` from infinity upto the point

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

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Electrostatic Potential Energy Electrostatic potential energy of a system of point charges is defined as the total amount of work done in bringing the different charges to their respective positions from infinitely large mutual separations.By definition, work done in carrying charge from `oo` to any point is W = Potential `xx` ChargeThis work is stored in the system of two point charges in the form of electrostatic potential energy U of the system.In the figure, proton moves a distance d in a uniform electric field `E` as shown in the figure. The work done on the proton by electric field

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

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A cell of emf (E) and internal resistance r is connected across a variable external resistance R . The graph of terminal potential difference V as a function of R

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

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(i) What is the effect on the interference fringes to a Young's double slit experiment when (a) the separation between the two slits is decreased? (b) the width of the source slit is increased? (c) the monochromatic source is replaced by a source of white light? Justify your answer in each case.(ii) The intensity at the central maxima in Young's double slit experimental set up is `I_0`. Show that the intensity at a point where the path difference is `lambda//3` , is

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

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A particle is moving three times as fast as an electron. The ratio of the de Broglie wavelength of the particle to that of the electron is 1.813 × 10–4. Calculate the particle’s mass and identify the

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Photon is quantum of radiation with energy E = hν where ν is frequency and h is Planck’s constant. The dimensions of h are the same as that

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

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The electrostatic force on a small sphere of charge 0.4 µC due to another small sphere of charge –0.8 µC in air is 0.2 N. What is the distance between the two

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An electric dipole with dipole moment 4 × 10–9 C m is aligned at 30° with the direction of a uniform electric field of magnitude 5 × 104 NC–1 . Calculate the magnitude of the torque acting on the

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Explain why A.C. is more dangerous than D.C.

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A galvanometer coil has a resistance of 15 Ω and the metre shows full scale deflection for a current of 4 mA. How will you convert the metre into an ammeter of range 0 to 6

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

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A short bar magnet placed with its axis at 30° with an external field of 800 G experiences a torque of 0.016 Nm.What is the magnitude of the equatorial and axial fields due to a bar magnet of length 5.0 cm at a distance of 50 cm from its mid-point? The magnetic moment of the bar magnet is 0.40 A

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

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Faraday Cage A Faraday cage or Faraday shield is an enclosure made of a conducting material. The fields within a conductor cancel out with any external fields, so the electric field within the enclosure is zero.These Faraday cages act as big hollow conductors. You can put things to shield them from electrical fields. Any electrical shocks the cage receives, pass harmlessly around the outside of the cage. An isolated point charge `+q` is placed inside the Faraday cage. Its surface must have charge equal

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Two equal and opposite charges `[+q and —q)` are situated at a distance `x` from each other. The value of potential at very far point will depend

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

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