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Two point positive charges q each are placed at (–a, o) and (a, o). A third positive charge qo is placed at (o, y). For which value of y the force at qo is maximum

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

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Two identical charged spheres suspended from a common point by two massless strings of length l are initially a distance `d (d << l )` apart because of their mutual repulsion. The charge begins to leak from both the spheres at a constant rate. As a result the spheres approach each other with a velocity υ . Then function of distance x between them becomes

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

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Three identical spheres each having a charge q and radius R, are kept in such a way thateach touches the other two spheares. The magnitude of the electric force on any spheredue to other two is

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

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Two equal negative charges –q are fixed at points (o, a) and (o, –a) on the Y axis. Apositive charge q is released from rest at the point `x (x < < a)` on the X-axis, then thefrequency of motion is

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

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Two identical balls having like charges and placed at a certain distance apart repel eachother with a certain force. They are brought in contact and then moved apart to a distanceequal to half their initial separation. The force of repulsion between them increases 4.5times in comparison with the initial value. The ratio of the initial charges of the balls

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

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A point charge q is situated at a distance r from one end of a thin conducting rod of length L having a charge Q (uniformly distributed along its length). The magnitude of electric force between the two, is

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

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Two point charges of +16µc and –9µc are placed 8 cm apart in air. ............... distance ofa point from –9µc charge at which the resultant electric field is

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

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Point charges 4µc and 2µc are placed at the vertices P and Q of a right angle triangle PQR respectively. Q is the right angle, `PR = 2 xx10^(-2) m` and `QR = 10^(-2) m` . The magnitude and direction of the resultant electric field at c is

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

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An inclined plane making an angle of `30^o` with the horizontal is placed in an uniform electric field `E = 100 Vm^(–1)`. A particle of mass 1 kg and charge 0.01 c is allowed to slide down from rest from a height of 1m. If the coefficient of friction is 0.2 the time taken by the particle to reach the bottom is ..........

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

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A small sphere whose mass is 0.1 gm carries a charge of `3 xx10^(-10) C` and is tieup to one end of a silk fibre 5 cm long. The other end of the fibre is attached to a large vertical conducting plate which has a surface charge of `25 xx10^(-6) Cm^(-2)` , on each side. When system is freely hanging the angle fibre makes with vertical is

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

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A Semicircular rod is charged uniformly with a total charge Q coulomb. The electric field intensity at the centre of curvature is

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

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The electron is projected from a distance d and with initial velocity `υ_o` parallel to a uniformly charged flat conducting plate as shown in figure. It strikes the plate after travelling a distance l along the direction. The surface charge density of conducting plate is equal

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

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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

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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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