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When a piece of polythene is rubbed with wool, a charge of `–2×10^(–7) C` is developed on polythene. What is the amount of mass, which is transferred to

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Two point charges `q_1=2 µc` and `q_2=1 µc` are placed at distance b = 1cm and a = 2 cm from the origin on the y and x axes as shown in figure. The electric field vector at point P (a, b) will subtend an angle `theta` with the X - axis given

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An oil drop of 12 excess electrons is held stationary under a constant electric field of `2.55×10^4 Vm^(-1)` . If the density of the oil is 1.26 gm/`cm^3` then the radius of the drop is ..........

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A hollow cylinder has a charge q coulomb within it. If `phi` is the electric flux in units of voltmeter associated with the curved surface B, the flux linked with the plane surface A in units of volt-meter will be

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A ball of mass 1 gm and charge `10^(–8) c` moves from a point A, where the potential is 600 volt to the point B where the potential is zero. Velocity of the ball of the point B is 20cm/s. The velocity of the ball at the point A will be

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A point charge causes an electric flux of –1.0 × 103 `Nm^2` /C to pass through a spherical Gaussian surface of 10.0 cm radius centred on the charge. If the radius of the Gaussian surface were doubled, how much flux would pass through the

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An oil drop of 12 excess electrons is held stationary under a constant electric field of 2.55 × 104 `NC^(–1)` (Millikan’s oil drop experiment). The density of the oil is 1.26 g `cm^(–3)`. Estimate the radius of the drop. (g = 9.81 m`cm^(–2)`; e = 1.60 × 10–19

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If there were only one type of charge in the universe,

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A square of side L meters lies in the x-y plane in a region, where the magnetic field is given by `B =B_o (2hati + 3hatj + 4hatk)` where Bo is constant. The magnitude of flux passing through the square

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A metallic ring of mass m and radius l (ring being horizontal) is falling under gravity in a region having a magnetic field. If z is the vertical direction, the z-component of magnetic field is `B_z = B_o (1+λ z)`. If R is the resistance of the ring and if the ring falls with a velocity v, find the energy lost in the resistance. If the ring has reached a constant velocity, use the conservation of energy to determine v in terms of m, B, λ and acceleration due to gravity

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If rotational velocity of a dynamo armature is doubled, then induced emf will become...What is increased in step down transformer

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What is the radius of the path of an electron (mass 9 × 10-31 kg and charge 1.6 × 10–19 C) moving at a speed of 3 ×107 m/s in a magnetic field of 6 × 10–4 T perpendicular to it? What is its frequency? Calculate its energy in keV. ( 1 eV = 1.6 × 10–19

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In Fig. , the magnetic needle has magnetic moment 6.7 × 10–2 Am2 and moment of inertia I = 7.5 × 10–6 kg m2 . It performs 10 complete oscillations in 6.70 s. What is the magnitude of the magnetic

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At a certain location in Africa, a compass points 12° west of the geographic north. The north tip of the magnetic needle of a dip circle placed in the plane of magnetic meridian points 60° above the horizontal. The horizontal component of the earth’s field is measured to be 0.16 G. Specify the direction and magnitude of the earth’s field at the

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At a distance of 10 cm from a long straight wire carrying current, the magnetic field is `4xx10^(-2)` . At the distance of 40 cm, the magnetic field will be

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The spatial distribution of the electric field due to charges (A, B) is shown in figure. Which one of the following statements is

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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.If an object is positively charged, theoretically, the mass of the

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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

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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

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Moving Coil GalvanometerMoving coil galvanometer operates on Permanent Magnet Moving Coil (PMMC) mechanism and was designed by the scientist D’arsonval.Moving coil galvanometers are of two types (i) Suspended coil (ii) Pivoted coil type or tangent galvanometer.Its working is based on the fact that when a current carrying coil is placed in a magnetic field, it experiences a torque. This torque tends to rotate the coil about its axis of suspension in such a way that the m agnetic flux passing through the coil is maximum .To increase the current sensitivity of a moving coil galvanometer, we should

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

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