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Why does the electric field inside a dielectric decrease when it is placed in an external electric

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Two charges ±10 µC are placed 5.0 mm apart. Determine the electric field at a point Q, 15 cm away from O on a line passing through O and normal to the axis of the dipole, as shown in fig.

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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 force on the second sphere due to the

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Consider an infinitely long wire carrying a current I (t ), with` dI/ dt = λ = constant`. Find the current produced in the rectangular loop of wire ABCD if its resistance is R (Fig.

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If the rms current in a 50 Hz ac circuit is 5 A, the value of the current 1/300 seconds after its value becomes zero

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Consider a tightly wound 100 turn coil of radius 10 cm, carrying a current of 1 A. What is the magnitude of the magnetic field at the centre of the

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Let `E_a` be the electric field due to a dipole in its axial plane distant `l` and let `E_q` be the field in the equatorial plane distant `l`, then the relation between `E_a and E_q` will

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A solid sphere of radius R has a charge Q distributed in its volume with a charge density `rho = k r^a`, where k and a are constants and r is the distance from its centre. If the electric field at `r = R/2` is `1/8`. times that at `r = R,` find the value of

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Assertion: Moment of inertia of a particle is different whatever be the axis of rotation. Reason: Moment of inertia does not depends on mass and distance of the particle from the axis of

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

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Define dielectric constant of a medium. What is its S.I. unit?

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Consider a uniform electric field E = 3 × 103 î N/C. What is the net flux of the uniform electric field of Exercise 1.15 through a cube of side 20 cm oriented so that its faces are parallel to the coordinate

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Two particles of equal mass `m` and charge `q` are placed at a distance of 16 cm. They do not experience any force. The value of `q/m`

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Assertion: The self-induced emf is also called the back emf. Reason: The self-induced emf opposes any change in the current in a

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Figure shows a uniform circular loop of radius ‘a’ having specific resistance `rho` placed in a uniform magnetic fieldB perpendicular to plane of figure. A uniform rod of length 2a & resistance R moves with a velocity v as shown.Find the current in the rod when it has moved a distance `a/2` from the centre of circular loop.[Given `B=sqrt3,a=2,v=3,rho=9/(4pi), R=2sqrt3` all in SI

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Eight dipoles of charges of magnitude e each are placed inside a cube. The total electric flux coming out of the cube will

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Electric Charges The physical property of matter that causes it to experience a force when placed in an electromagnetic field is called electric charge. Electric charge is a characteristic that accompanies fundamental particles, wherever they exist. The process of charging a neutral body by bringing a charged body nearby it without making contact between the two bodies is known as charging by induction.Figures given below are showing the sequential steps of charging a conductor permanently by using the process of charging by induction.When a glass rod is rubbed with silk, it becomes positively charged

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Resistance and Resistivity The materials can be classified as conductors, semiconductors and insulators depending on their resistivities, in an increasing order of their values. Metals have low resistivities in the range of `10^(-8)Omegam` to `10^(-6)Omegam`. At the other end are insulators like ceramic, rubber and plastics having resistivities `10^(18)` times greater than metals or more. In between these two are the semiconductors. These however, have resistivities characteristically decreasing with a rise in temperature. The resistivities of semiconductors can be decreased by adding small amount of suitable impurities. This last feature is exploited in use of semiconductors for electronic devices.Commercially produced

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EMF of a CellAn electric cell is a source of energy that maintains a continuous flow of charge in a circuit. It changes chemical energy into electrical energy. It has two electrodes, positive electrode and negative electrode as shown below.Electric cell has to do some work in maintaining the current through a circuit. The work done by the cell in moving unit positive charge through the whole circuit (including the cell) is called the electromotive force (emf) of the cell. For the given circuit, if the cell has an emf of `2 V` and the internal resistance of this cell

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

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Two electric charges 12µc and –6µc are placed 20cm apart in air. There will be a point P on the line joining these charges and outside the region between them, at which the electric potential is zero. The distance of P from –6µc charge is

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When a body induces charge on another body without touching

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

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