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Two equal point charges are fixed at x=-a and x=+a on the x-axis. Another point charge Q is placed at the origin. The change in the electrical potential energy of Q, when it is displaced by a small distance x along th ...

Two fixed, equal, positive charges, each of magnitude 5×10-5 C are located at point A and B separated by a distance 6 m. An equal and opposite charge moves towards them along the line COD, the perpendicular bisector of the l ...

Three point charges q, 2q and 8q are to be placed on a 9 cm long straight line. coordinates of the ends of line are (0,0) and (9,0). For minimum potential energy the coordinates of the charges are (in order of q, 2q, 8q) ...

Two equal negative charges -q are fixed at points (0,a) and (0,-a) on the y-axis. A positive charge Q is released from rest at the point (2a,0) on the x-axis. The charge Q will ...

Three charges Q, +q and -q are placed at the vertices of a right-angled isosceles triangle as shown. The net electrostatic energy of the configuration is zero if Q is equal to *Image* ...

Two point charges +q and -q are held fixed at (-d,0) and (d,0) respectively of a x-y coordinate system. Then ...

Two equal point charges are fixed at x=-a and x=+a on the x-axis. Another point charge Q is placed at the origin. The change in the electrical potential energy of Q, when it is displaced by a small distance x along th ...

The bhor radius of the first orbit of H atom is 0.503A° units.The radius of the third orbit will be ...

A reversible adiabatic expansion is an ...

The pH of 0.1 M NH4OH (Kb=1.8*105 is ...

Which of the following is a "superacid" ...

A hollow metal sphere of radius 5 cm is charged such that the potential on its surface is 10 volts. The potential at the centre of the sphere is ...

Two identical thin rings, each of radius R metres, are coaxially placed a distance R metres apart. If Q1 and Q2 are the charges uniformly spread on the two rings, the work done in moving a charge q from the centre of one ring ...

A charge +q is fixed at each of the points x=x0, x=3x0, x=5x0 ......∞ on the x-axis and a charge -q is fixed at each points x=2x0, x=4x0, x=6x0, ........ Here x0 is a positive quantity. The potential ...

A non conducting ring of radius 0.5 m carries a total charge of 1.11×10-10 C is distributed non-uniformly on its circumference producing an electric field everywhere in space. The value of the integral l=∞∫l=0-E. ...

The electric potential V at any point x,y,z (all in metres) in space is given by V=4x2 volts. The electric field at the point (1,0,2) is ...

Four point charges, each of value +q C, are placed on four vertices of a regular pentagon whose vertices are at distance L from the centre. The force on the point charge of value -q C placed at the centre of the pentagon is( ...

An electron of mass me, initially at rest, moves through a certain distance in a uniform electric field in time t1. A proton of mass mp, also initially at rest, takes time t2 to move through an equal distance in this uniform ...

Six charges of equal magnitude, 3 positive and 3 negative are to be placed on PQRSTU corners of a regular hexagon, such that field at the centre is double that of what it would have been if only one +ve charge is placed at R ...

A charge q is placed at the centre of line joining two equal charges Q. The system of the three charges will be in equilibrium if q is equal to ...

Two small ball having equal positive charges Q on each are suspended by two insulating strings of equal length L from a hook fixed to a stand. The whole setup is taken in a satellite into space where there is no gravity. The ...

Five point charges, each of value +q C, are placed on five vertices of a regular hexagon of side L m. The magnitude of the force on the point charge of value -q C placed at the centre of the hexagon is ...

A solid body X of heat capacity C is kept in an atmosphere whose temperature is 300K. At t=0 temperature of X is 400K. It cools according to Newton's Law of cooling.At time t1 its temperature is found to be 350 K .At ...

Hot oil is circulated through an insulated container with a wooden lid at the top whose conductivity K=0.149 J/m/°C thickness t=5mm, emissivity=0.6. Temperature of the top of the lid is maintained at Tl=127° ...

Three discs A, B and C having radii 2,4 and 6 cm respectively are coated with carbon black. Wavelength for maximum intensity for the three discs are 300, 400 and 500 nm respectively. If QA, QB, QC are power emitted by A, B an ...

The temperature (T) versus time (t) graph of two bodies X and Y with equal surface areas are shown in the figure. If the emissivity and the absorptivity of X and Y are EX, EY and AX and AY respectively, then *Image* ...

An ideal black body at room temperature is thrown into a furnace. It is observed that ...

A wall has two layers A and B, each made of different material. Both the layers have the same thickness. The thermal conductivity of the material of A is twice that of B. Under thermal equilibrium, the temperature difference ...

Three rods of identical cross-sectional area and made from the sides of an isosceles triangle ABC, right-angled at B. The point A and B are maintained at temperatures T and √2T respectively. In the steady state, the tempera ...

Two identical rods are connected between two containers, one of them is at 100°C and another at 0°C. If two identical rods are connected in parallel then the rate of melting of ice is q1 gm/sec. If they are connected in ser ...