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For a spherically symmetrical charge distribution, electric field at a distance r from the centre of sphere is `vecE=kr^7hatr`, where k is a constant. What will be the volume charge density at a distance r from the centre of sphere

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

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Two positrons `(e^+)` and two protons (p) are kept on four corners of a square of side a as shown in figure. The mass of proton is much larger than the mass of positron. Let q denotes the charge on the proton as well as the positron then the kinetic energies of one of the positrons and one of the protons respectively after a very long time will

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

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Four charges are placed at the circumference of a dial clock as shown in figure. If the clock has only hour hand, then the resultant force on a charge `q_0` placed at the centre, points in the direction which shows the time as

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

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A small electric dipole is placed at origin with its dipole moment directed along positive x-axis. The direction of electric field at point `(2, 2sqrt2,0)`

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

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Uniform electric field of magnitude 100 V/m in space is directed along the line `y= 3 + x`. Find the potential difference between point `A (3, 1) & B

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

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The diagram shows a uniformly charged hemisphere of radius R. It has volume charge density `rho`. If the electric field at a point 2R distance above its centre is E then what is the electric field at the point which is 2R below its

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

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A metallic rod of length `l` rotates at angular velocity `omega` about an axis passing through one end and perpendiuclar to the rod. If mass of electron is m and its charge is –e then the magnitude of potential difference between its two ends

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

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Consider a finite charged rod. Electric field at Point P (shown) makes an angle `theta` with horizontal dotted line then angle `theta` is

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

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The electric potential in a region is given by the relation `V(x) = 4 + 5x^2` . If a dipole is placed at position (–1,0) with dipole moment `vecp` pointing along positive Y-direction,

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

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What is the angular acceleration of the rod at the instant of releasing the rod? A thin homogeneous rod of mass m and length `l` is free to rotate in vertical plane about a horizontal axle pivoted at one end of the rod. A small ball of mass m and charge q is attached to the opposite end of this rod. The whole system is positioned in a constant horizontal electric field of magnitude mg `E=(mg)/(2q)`. The rod is released from shown position from

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

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What is the acceleration of the small ball at the instant of releasing the rod? A thin homogeneous rod of mass m and length `l` is free to rotate in vertical plane about a horizontal axle pivoted at one end of the rod. A small ball of mass m and charge q is attached to the opposite end of this rod. The whole system is positioned in a constant horizontal electric field of magnitude mg `E=(mg)/(2q)`. The rod is released from shown position from

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

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What is the speed of ball when rod becomes vertical? A thin homogeneous rod of mass m and length `l` is free to rotate in vertical plane about a horizontal axle pivoted at one end of the rod. A small ball of mass m and charge q is attached to the opposite end of this rod. The whole system is positioned in a constant horizontal electric field of magnitude mg `E=(mg)/(2q)`. The rod is released from shown position from

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

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A simple pendulum is suspended in a lift which is going up with an acceleration of `5 m'/'s^2` . An electric field of magnitude 5 N/C and directed vertically upward is also present in the lift . The charge of the bob is `1 muC` and mass is 1 mg . Taking `g=pi^2` and length of the simple pendulum 1m, find the time period of the simple pendulum (in

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

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The variation of potential with distance x from a fixed point is shown in figure. Find the magnitude of the electric field (in `V'/'m`) at `x

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

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The energy density u is plotted against the distance r from the centre of a spherical charge distribution on a log-log scale. Find the magnitude of slope of obtianed straight

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

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The figure shows four situations in which charges as indicated `(q > 0)` are fixed on an axis. How many situations is there a point to the left of the charges where an electron would be in

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

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An electric field is given by `vecE=(yhati+xhatj)N/C`. Find the work done (in J) in moving a 1C charge from `vecr_A=(2hati+2hatj)m` to

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

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The arrangement shown consists of three elements. (i) A thin rod of charge `–3.0 muC` that forms a full circle of radius 6.0 cm. (ii) A second thin rod of charge `2.0 muC` that forms a circular arc of radius 4.0 cm and concentric with the full circle, subtending an angle of 90° at the centre of the full circle. (iii) An electric dipole with a dipole moment that is perpendicular to a radial line and has magnitude `1.28 × 10^(–21)C-m.` Find the net electric potential in volts at the

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

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Six charges are kept at the vertices of a regular hexagon as shown in the figure. If magnitude of force applied by +Q on +q charge is F, then net electric force on the +Q is nF. Find the value of n.

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

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Electric field in a region is given by `vecE=-4xhati+6yhatj`. The charge enclosed in the cube of side 1m oriented as shown in the diagram is given by `alphaepsilon_0` . Find the value of

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

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