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Figure (a) and (b) shows the field lines of a single positive and negative changes respectively(a) Give the signs of the potential difference : `Vp -Vq and V_B - V_A`(b) Give the sign of the work done by the field in moving a small positive change from Q to P.(c) Give the sign of the work done by the field in moving a small negative change from B to

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

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With the help of a labelled diagram, explain the principle, construction and working of a vandegraff generator. Mention its

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

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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

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

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`10^(12) alpha` – particles (Nuclei of helium) per second falls on a neutral sphere, calculate time in which sphere gets charged by

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

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If the distance between two equal point charges is doubled and their individual charges are also doubled, what would happen to the force between

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

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A particle of mass m carrying charge `'+q_1 '` is revolving around a fixed charge `'–q_2'` in a circular path of radius r. Calculate the period of

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

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The force of repulsion between two point charges is F, when these are at a distance of 1 m. Now the point charges are replaced by spheres of radii 25 cm having the charge same as that of point charges. The distance between their centres is 1 m, then compare the force of repulsion in two

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

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For the system shown in figure find Q for which resultant force on q is

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

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Two identically charged spheres are suspended by strings of equal length. The strings make an angle of 300 with each other. When suspended in a liquid of density 0.8 g/cc the angle remains same. What is the dielectric constant of liquid. Density of sphere = 1.6

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

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Given a cube with point charges q on each of its vertices. Calculate the force exerted on any of the charges due to rest of the 7

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

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Five point charges, each of value +q are placed on five vertices of a regular hexagon of side Lm. What is the magnitude of the force on a point charge of value –q coulomb placed at the centre of the

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

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Calculate the electric field at origin due to infinite number of charges as shown in figures

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A charged particle is kept in equilibrium in the electric field between the plates of millikan oil drop experiment. If the direction of the electric field between the plates is reversed, then calculate acceleration of the charged

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

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Calculate the electric field intensity E which would be just sufficient to balance the weight of an electron. If this electric field is produced by a second electron located below the first one what would be the distance between them? [Given : `e=1.6 × 10^(-19) C, m = 9.1 × 10^(–31) kg and g = 9.8

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

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A block having mass `m = 4 kg` and charge `q=50 muC` is connected to a spring having a force constant `k=100 N'/'m`. The block lies on a frictionless horizontal track and a uniform electric field `E=5×10^5` V/m acts on the system as shwon in figure. The block is released from rest when the spring is unstretched (at `x = 0`) (a) By what maximum amount does the spring expand? (b) What is the equilibrium position of the block? (c) Show that the block's motion is simple harmonic and determine the amplitude and time period of the

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

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If a point charge q is placed at the centre of a cube. What is the flux linked (a) with the cube? (b) with each face of the

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

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If a point charge q is placed at one corner of a cube, what is the flux linked with the

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

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As shown in figure a closed surface intersects a spherical conductor. If a negative charge is placed at point P. What is the nature of the electric flux coming out of the closed surface

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

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Consider `vecE=3×10^3 hati` (N/C) then what is the flux through the square of 10 cm side, if the normal of its plane makes 60° angle with the X

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

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Find the electric field due to an infinitely long cylindrical charge distribution of radius R and having linear charge density `lambda` at a distance half of the radius from its

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

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