Which charge configuration produces a uniform electric field?

An electric dipole is placed at an alignment angle of 30^o with an electric field of 2 x 10⁵ NC^-1. It experiences a torque equal to 8 N m. The charge on the dipole if the dipole length is 1 cm is

The total electric flux for the following closed surface which is kept inside water

The electric field created by a _________ is basically a non-uniform electric field.

The unit for electric susceptibility is

Find the electric field at x = 5m from the graph.

In a large building, there are 15 bulbs of 40 W, 5 bulbs of 100 W, 5 fans of 80 W and 1 heater of 1 kW are connected. The voltage of electric mains is 220 V. The maximum capacity of the main fuse of the building will be ______.

In an oscillating LC circuit, the maximum charge on the capacitor is Q. The charge on the capacitor when the energy is stored equally between the electric and magnetic fields is

The electric and magnetic fields of an electromagnetic wave are _____.

The threshold wavelength for a metal surface whose photoelectric work function is 3.313 eV is _____.

What is meant by quantisation of charges?

Write a short note on superposition principle.

What is meant by ‘electric field lines’?

Write the general definition of electric dipole moment for a collection of point charge.

Write a short note on ‘electrostatic shielding’.

What is a Capacitor?

What do you mean by Potential Energy of an electric dipole, when placed in electric field?

Gauss law is true for any closed surface, no matter what its shape or size is. Justify.

Two charge d spherical conditioners of radii R₁ & R₂ when connected by a conducting wire acquire charges q₁ & q₂ respectively. Find the ratio of surface charge densities in terms of their radii.

What is the effective resistance of resistors connected in series?

What do you mean by parallel combination of cells?

Of which material is a potential wire normally made and why?

State Coulomb’s inverse law.

What is forbidden energy gap?

What is called reverse saturation current?

How do we determine the electric field due to a continuous charge distribution? Explain.

Derive an expression for electrostatic potential energy of the dipole in a uniform electric field.

Explain in detail the effect of a dielectric placed in a parallel plate capacitor.

What happens when and electric dipole is held in a non-uniform electric field?

What is dielectrics or insulators.

Define and derive an expression for the energy density in parallel plate capacitor.

How the emf of two cells are compared using potentiometer?

Derive an expression of drift velocity and write the relation between drift velocity and mobility.

Show that Lenz’s law is in accordance with the law of conservation of energy.

Define self-inductance of a coil interms of
(i) magnetic flux and
(ii) induced emf.

Write an expression for the momentum of Electromagnetic wave.

A variable frequency ac source is connected to capacitor. How will the displacement current change with decrease in frequency.

An electron and a proton have the same kinetic energy. Which one of the two has the larger de Broglie wavelength and why?

Derive the energy expression for an electron is the hydrogen atom using Bohr atom model.

Write the applications of internet.

The following figure represents the electric potential as a function of x – coordinate. Plot the corresponding electric field as a function of x.

A water molecule has an electric dipole moment of 6.3 x 10^-30 Cm. A sample contains 10²² water molecules, with all the dipole moments aligned parallel to the external electric field of magnitude 3 x 10⁵ NC^-1. How much work is required to rotate all the water molecules from θ = 0° to 90°? 

Suppose a charge +q on Earth’s surface and another +q charge is placed on the surface of the Moon.
(a) Calculate the value of q required to balance the gravitational attraction between Earth and Moon.
(b) Suppose the distance between the Moon and Earth is halved, would the charge q change?
(Take m_E = 5.9 x 10²⁴ kg, m_M = 7.9 x 10²² kg)

Explain in detail the Electrostatic Potential difference between the charges.

A thin metallic spherical shell of radius R carries a charge Q on its surface. A point charge \(\frac{Q}{2}\) is placed at the centre C and another is placed at the centre C and another a distance x from the centre as shown in the figure.

(i) Find the electric flux through the shell.
(ii) Find the force on the charges at C and A.

A copper slab of mass 2g contains 2 x 10²² atoms. The charge on the nucleus of each atom is 29 e. What fraction of the electrons must be removed from the sphere to give it a charge of +2μC?

Two point charges having equal charges separated by 1m distance experiences a force of 8N. What will be the force experienced by them, if they are held in water at the same distance?

An electric dipole of length 4cm, when placed with its axis making an angle of 60° with a uniform electric field, experiences a torque of 4√3 Nm. Calculate the potential energy of the dipole, if it has charge ± 8nC.

From the given circuit,

Find
i) Equivalent emf of the combination
ii) Equivalent internal resistance
iii) Total current
iv) Potential difference across external resistance
v) Potential difference across each cell

Explain what is
(i) Thomson effect,
(ii) Positive Thomson effect,
(iii) Negative effect.

Explain magnetic dipole moment of a revolving electron.

Draw graphs showing the distribution of charge in a capacitor and current through an inductor during LC oscillations with respect to time. Assume that the charge in the capacitor is maximum initially.

Straight in LC oscillations, the sum of energies stored in capacitor & the inductors is constant in time.

A wheel with 10 metallic spokes each 0.5m long is rotated with a speed of 120 rev/min in a plane normal to the horizontal component of the earth's magnetic field HE at a place if H_E = 0.4 G at the place what is the induced emf between the a x k and the rim of the wheel? Take 1 gauss (G) = 10^-4T.

What is RADAR? Explain its function. State its applications