Questions by varun

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(a) An air filled capacitor is given a charge of 2 µ C raising its potential to 200 V. If on inserting a dielectric medium, its potential falls to 50 V, what is the dielectric constant of the medium?(b) A conducting stab of thickness‘t’ is introduced without touching between the plates of a parallel plate capacitor separated by a distance d (t < d). Derive an expression for the capacitance of a

asked Mar 20, 2022 in 12th Physics

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The Plates of a charged capacitor are connected by a voltmeter. If the plates of the capacitor are moved further apart. What will be the effect on the reading of the

asked Mar 20, 2022 in 12th Physics

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What happens to the capacitance of a capacitor when a dielectric slab is placed between its

asked Mar 20, 2022 in 12th Physics

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A steam of electrons travelling with speed `υ m/s` at right angles to a uniform electric field E is deflected in a circular path of radius r. Prove that `e/m=v^2/(rE)` =

asked Mar 20, 2022 in 12th Physics

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The distance between the plates of a parallel plate capacitor is d. A metal plate of thickness (d/2) is placed between the plates. What will be the effect on the

asked Mar 20, 2022 in 12th Physics

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Keeping the voltage of the charging source constant. What would be the percentage change in the energy stored in a parallel plate capacitor if the separation between its plates were to be decreased by

asked Mar 20, 2022 in 12th Physics

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Two identical plane metallic surfaces A and B are kept parallel to each other in air separated by a distance of 1.0 cm as shown in the figure. Surface A is given a positive potential of 10V and the outer surface of B is earthed.(a) What is the magnitude and direction of uniform electric field between point Y and Z? What is the work done in moving a change of 20 µc from point X to Y?(b) Can we have non-zero electric potential in the space, where electric field strength is

asked Mar 20, 2022 in 12th Physics

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Figure (a) and (b) shows the field lines of a single positive and negative changes respectively(a) Give the signs of the potential difference : `Vp -Vq and V_B - V_A`(b) Give the sign of the work done by the field in moving a small positive change from Q to P.(c) Give the sign of the work done by the field in moving a small negative change from B to

asked Mar 20, 2022 in 12th Physics

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With the help of a labelled diagram, explain the principle, construction and working of a vandegraff generator. Mention its

asked Mar 20, 2022 in 12th Physics

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A solid conducting sphere of radius a has a net positive charge 2Q. A conducting spherical shell of inner radius b and outer radius c is concentric with the solid sphere and has a net charge– Q.The surface charge density on the inner and outer surfaces of the spherical shell will be

asked Mar 20, 2022 in 12th Physics

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The surface charge density of a thin charged disc of radius R is σ. The value of the electric field at the centre of the disc is sigma/(2in_0)`. With respect to the field the centre, the electric field along the axis at a distance R from the centre of the disc reduces

asked Mar 20, 2022 in 12th Physics

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In the figure, the net electric flux through the area A is `phi=vecE.vecA` when the system is in air. On immersing the system in water the net electric flux through the

asked Mar 20, 2022 in 12th Physics

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An electric dipole is placed in a uniform electric field. The dipole will

asked Mar 20, 2022 in 12th Physics

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Figure shows two charges of equal magnitude separated by a distance 2a. As we move away from the charge situated at x = 0 to the charge situated at `x=2a`, which of the following graphs shows the correct behaviour of electric field

asked Mar 20, 2022 in 12th Physics

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An uniform electric field E exists along positive x-axis. The work done in moving a charge 0.5 C through a distance 2 m along a direction making an angle 60° with x-axis is 10 J. Then the magnitude of electric field

asked Mar 20, 2022 in 12th Physics

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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 T/3 with the x-axis. If the electric field at P makes an angle 0 with the x-axis, the value of 0 would

asked Mar 20, 2022 in 12th Physics

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A spherically symmetric charge distribution is characterised by a charge density having the following variations: `rho(r)=rho_o (1-r/R)` for `r < R rho(r)=0` for `r ge R` Where r is the distance from the centre of the charge distribution p, is a constant. The electric field at an internal point (r < R)

asked Mar 20, 2022 in 12th Physics

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A charge q is placed at the centre of the open end of a cylindrical vessel. The flux of the electric field through the surface of the vessel is

asked Mar 20, 2022 in 12th Physics

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A short electric dipole of dipole moment `vecp` is placed at a distance r from the centre of a solid metallic sphere of radius a

asked Mar 20, 2022 in 12th Physics

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A semi-circular arc of radius ‘a’ is charged uniformly and the charge per unit length is A. The electric field at the centre of this arc

asked Mar 20, 2022 in 12th Physics

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