Recent questions tagged #mcq

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Two point masses m each carrying charge –q and +q are attached to the ends of a massless rigid non-conducting rod of length l. The arrangement is placed in a uniform electric field E such that the rod makes a small angle `5^0` with the field direction. The minimum time needed by the rod to align itself along the field is

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

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Two uniformaly charged spherical conductors A and B having radius 1mm and 2mm are separated by a distance of 5 cm. If the spheres are connected by a conducting wire then in equilibrium condition, the ratio of the magnitude of the electric fields at the surfaces of spheres A and B is

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

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Let `P(r) = Q/(πR^4)r` be the charge density distribution for a solid sphere of radius R and total charge Q. For a point ‘P’ inside the sphere at distance `r_1` from the centre of the sphere the magnitude of electric field

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

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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

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

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A simple pendulum consists of a small sphere of mass m suspended by a thread of length `l`. The sphere carries a positive charge q. The pendulum is placed in a uniform electric field of strength E directed Vertically upwards. If the electrostatic force acting on the sphere is less than gravitational force the period of pendulum

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

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Consider a system of three charges `q/3, q/3 and –2a/3` placed at points A, B and C respectively as shown in the figure. It the radius of the circle is R and `/_CAB = 60^o` then the electric field at centre 0 is ........

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

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In Millikan’s oil drop experiment an oil drop carrying a charge Q is held stationary by a p.d. 2400 v between the plates. To keep a drop of half the radius stationary the potential difference had to be made 600 v. What is the charge on the second drop

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

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Equal charges q are placed at the vertices A and B of an equilateral triangle ABC of side a. The magnitude of electric field at the point c is

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 `π/ 3` with the x-axis. If the electric field at P makes an angle `theta` with the x-axis, the value of `theta` would be

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

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A particle having a charge of `1.6xx 10^(-19) C` enters between the plates of a parallel plate capaciter. The initial velocity of the particle is parallel to the plates. A potential difference of 300v is applied to the capacitor plates. If the length of the capacitor plates is 10cm and they are separated by 2cm, Calculate the greatest initial velocity for which the particle will not be able to come out of the plates. The mass of the particle is `12xx 10^(-24) kg`

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

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A charged particle of mass 1 kg and charge 2µc is thrown from a horizontal ground at an angle `theta = 45^o` with speed 20m/s. In space a horizontal electric field `E = 2 xx10^7 `V/m exist. The range on horizontal ground of the projectile thrown is ...............

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

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If electron in ground state of H-atom is assumed in rest then dipole moment of electron proton system of H-atom is ............... . Orbit radius of H atom in ground state is `0.56 A^o`

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

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At what angle θ a point P must be located from dipole axis so that the electric fieldintensity at the point is perpendicular to the dipole axis

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

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A n electric dipole is placed at an angle of 60o with an electric field of intensity `10^5 NC^(–1)` . It experiences a torque equal to `8 sqrt3Nm` . If the dipole length is 2cm then the charge on the dipole is ...........

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

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An electric dipole coincides on z axis and its mid point is on origin of the cartesian co-ordinate system. The electric field at an axial point at a distance z from origin is `vecE`(z) and electric field at an equatorial point at a distance y from origin is `vecE(y) |vecE_((z))/vec E_((y))| (y = z > > a) =`

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

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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 ..........

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 cylindrical vessel. The flux of theelectric field through the surface of the vessel is

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

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The inward and outward electric flux for a closed surface in units of `Nm^2` /C are respectively `8 xx10^3` and `4 xx10^3` . Then the total charge inside the surface is ...........

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

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A sphere of radius R has a uniform distribution of electric charge in its volume. At adistance x from its centre, (for x < R), the electric field is directly proportional to

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

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The electric flux for gaussian surface A that enclose the chrged particles in free space is ............. (given `q_1 = –14nc, q_2 = 78.85 nc, q_3 =

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

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