Recent questions tagged #mcq

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Given that `q_1 + q_2 = q` if the between `q_1` and `q_2` is maximum, `q_1/q`

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

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Two small conducting sphere of equal radius have charges +1µc and – 2µc respectively and placed at a distance d from each other experience force F1 . If they are brought in contact and separated to the same distance, they experience force F2 . The ratio of F1 to F2 is

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

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Three charges, each of value Q, are placed at the vertex of an equilateral triangle. A fourth charge q is placed at the centre of the triangle. If the charges remains stationery then, q =

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

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Tw o small charged spheres repal each other with a force `2 xx10^(-3) N` . The charge on one sphere is twice that of the other. When these two spheares displaced 10 cm further apart the force is `5xx 10^(-4) N` , then the charges on both the spheres are

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 placed as shown in figure. The x component of the force on –q1 is proportional to

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). A positive charge Q is released from rest at the point (2a, o) on the X - axis. The charge Q will

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

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Four charges, each equal to –Q, are placed at the corners of a square and a charge +q isplaced at its centre. If the system is in equilibrium, the value of q is

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

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For the system shown in figure, if the resultant force on q is zero, then Q =

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

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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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