Recent questions tagged #mcq

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Figure shows two charges of equal magnitude separated by a distance 2a. As we move away from the charge situated at x = 0 to the charge situated at `x=2a`, which of the following graphs shows the correct behaviour of electric field

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

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An uniform electric field E exists along positive x-axis. The work done in moving a charge 0.5 C through a distance 2 m along a direction making an angle 60° with x-axis is 10 J. Then the magnitude of electric field

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

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An electric dipole is placed along the x-axis at the origin O. A point P is at a distance of 20 cm from this origin such that OP makes an angle T/3 with the x-axis. If the electric field at P makes an angle 0 with the x-axis, the value of 0 would

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

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A spherically symmetric charge distribution is characterised by a charge density having the following variations: `rho(r)=rho_o (1-r/R)` for `r < R rho(r)=0` for `r ge R` Where r is the distance from the centre of the charge distribution p, is a constant. The electric field at an internal point (r < R)

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

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A charge q is placed at the centre of the open end of a cylindrical vessel. The flux of the electric field through the surface of the vessel is

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

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A short electric dipole of dipole moment `vecp` is placed at a distance r from the centre of a solid metallic sphere of radius a

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

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A semi-circular arc of radius ‘a’ is charged uniformly and the charge per unit length is A. The electric field at the centre of this arc

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

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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 voltmeter will

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

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A point Q lies on the perpendicular bisector of an electrical dipole of dipole moment p. If the distance of Q from the dipole is r(much larger than the size of the dipole), then the electric field at Q is proportional

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

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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

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

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

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

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A small sphere carrying a charge q' is hanging in between two parallel plates by a string of length L. Time period of pendulum is `T_o`. When parallel plates are charged, the time period changes to T. The ratio T/`T_o` is equal

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

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In a medium of dielectric constant K, the electric field is E. If `in_o` is permittivity of the free space, the electric displacement vector

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

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Three charges `-q_1, +q_2, and -q_3`, are R placed as shown in the figure. The x - component of the force on `-q_1`,

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

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An oil drop of radius r and density `rho` is held stationary in a uniform vertically upwards electric field 'E'. If `rho_0 (< rho)` is the density of air and e is quanta of charge, then the drop

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

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A surface has the area vector `vecA= (2hati + 3hatj)m^2`. The flux of an electric field through itifthe field is `vecE=-4hati V/m`

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

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

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A square surface of side L. meter in the plane of the paper is placed in a uniform electric field `E ('volt'/m)` acting along the same plane at an angle `theta` with the - horizontal side of the square as shown in Figure. The electric flux linked to

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

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Two point dipoles of dipole moment `vecp_1 and vecp_2`. are at a distance x from each other and `vecp_1`||`vecp_2`. The force between the dipoles is

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

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In a uniformly charged sphere of total charge Q and radius R, the electric field E is plotted as function of distance from the centre. The graph which would correspond to the above will

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

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