Recent questions in Electric charges and fields

What is electrostatic shielding ? . How is this properly used in actual practice ? Is the potential in the cavity of a charged conductor zero ?

asked May 30, 2016 by meena.p

1 answer

Write briefly the underlying principle used in Davison - germer experiment to verify wave nature of electron experimentally. What is the de- Broglie wavelength of an electron with kinetic energy (K.E) 120 eV?

asked May 30, 2016 by meena.p

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State two properties of electromagnetic waves.How can we show that em waves carry momentum ?

asked May 30, 2016 by meena.p

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Write the functions of a (i) transducer and (ii) repeater in a communication system.

asked May 30, 2016 by meena.p

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The energy levels of a hypothetical atom are shown below. Which of the shown transitions will result in the emission of photon wave length.

asked May 30, 2016 by meena.p

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The power factor of an a.c circuit is 0.5 . What is the phase difference between voltage and current in the circuit ?

asked May 30, 2016 by meena.p

1 answer

In which situation is there a displacement current but no conduction current ?

asked May 30, 2016 by meena.p

1 answer

Define the term relaxation time in a conductor .

asked May 30, 2016 by meena.p

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Two wires one of copper and other of manganin have same resistance and equal length. Which wire is thicker and why ?

asked May 30, 2016 by meena.p

1 answer

Name of the logic gates marked P and Q in the given circuit

asked May 30, 2016 by meena.p

1 answer

You are given prisms made of crown glass and flint glass with a wide variety of angles. suggest a combination of prism which will deviate a pencil of white light with out much dispersion .

asked May 17, 2016 by meena.p

1 answer

A straight horizontal conducting rod of length $0.45\;m$ and mass $60\;g$ is suspended by two vertical wires at its ends. A current of $5.0\;A$ is setup in the rod through the wires . What magnetic field should be setup normal to the conductor in order that the tension in the wires is zero?

asked Jul 28, 2015 by meena.p

1 answer

Three point charges $+2q,-q$ and $+3q$ . What is the electric flux due to this configuration through the surface S?

asked Jul 8, 2015 by meena.p

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If a point change be rotated in a circle of radius r around a charge q, what will be the work done ?

asked Jul 8, 2015 by meena.p

1 answer

The number of electric lines of force radiating from a closed surface vaccum is $1.13 \times 10^{11}$ . The change enclosed by the surface is

asked Jul 8, 2015 by meena.p

1 answer

Electrostatic potential V at a point of a distance r from a charge q varies as

asked Jul 8, 2015 by meena.p

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Wire is bent in a circle of radius $10\;cm$ It is given a change on it uniformly. What is the electric potential at the center ?

asked Jul 8, 2015 by meena.p

1 answer

Three charges $+q, 2q$ and $-4 q$ are placed on the three vertices of an equilateral triangle of each side $0.1\;m$ calculate electrostatic potential energy of the system , take $q= 10^{-7} \;c$

asked Jul 8, 2015 by meena.p

1 answer

ABC is an equilateral triangle of each side $5 \;cm$ . Two charges of $\pm \large\frac{50}{3}$ $\times 10^{-3} \mu c$ are placed at A and B respectively . Calculate the magnitude and direction of resultant intensity at C.

asked Jul 8, 2015 by meena.p

1 answer

Potential energy of an electric dipole at an angle $\theta$ in a uniform electric field is zero when $\theta= ?$

asked Jul 8, 2015 by meena.p

1 answer

Electric field due to an electric dipole is

asked Jul 8, 2015 by meena.p

1 answer

In the figure two positive charges $q_2$ and $q_3$ fixed along the y-axis , exert a net electric force in the $+x$ direction on a change $q_1$ fixed along the x-axis . If a positive charge Q is added at $(x,0)$ , then the force on $q_1$

asked Jul 8, 2015 by meena.p

1 answer

Careful measurement of the electric field at the surface of a black box indicate that net outward flux through the surface of the box is $8.0 \times 10^3 Nm^3 C^{-1}$ If the net outward flux through the surface that there were no changes inside the box. Why or why not ?

asked Apr 29, 2015 by meena.p

1 answer

Careful measurement of the electric field at the surface of a black box indicate that net outward flux through the surface of the box is $8.0 \times 10^3 Nm^3 C^{-1}$ What is the net charge inside the box ?

asked Apr 29, 2015 by meena.p

1 answer

Electric charge is distributed uniformly on the surface of a spherical rubber balloon. show how the value of electric intensity vary On outside the surface?

asked Apr 29, 2015 by meena.p

1 answer

Electric charge is distributed uniformly on the surface of a spherical rubber balloon. show how the value of electric intensity vary inside the surface ?

asked Apr 29, 2015 by meena.p

1 answer

Electric charge is distributed uniformly on the surface of a spherical rubber balloon. show how the value of electric intensity vary On the surface?

asked Apr 29, 2015 by meena.p

1 answer

When an electric dipole of moment $|P|=q \times 2a$ is held at an angle $\theta$ with the direction of uniform external field E, a torque $T= PE \sin \theta$ acts on the dipole. This torque tries to align the electric dipole in the direction of the field. When P is along E $\theta =0^{\circ} , t= PE \sin 0=zero$ An electric dipole of length 10 cm having a charge $\pm6 \times 10^{-3} \;C$ placed at $30^{\circ}$ with respect to a uniform electric field experiences a torque of magnitude $6 \sqrt 3 N-m$ . Calculate magnitude of electric field.

asked Apr 29, 2015 by meena.p

1 answer

When an electric dipole of moment $|P|=q \times 2a$ is held at an angle $\theta$ with the direction of uniform external field E, a torque $T= PE \sin \theta$ acts on the dipole. This torque tries to align the electric dipole in the direction of the field. When P is along E $\theta =0^{\circ} , t= PE \sin 0=zero$ What is the direction of torque acting on electric dipole held at an angle with uniform electric field?

asked Apr 29, 2015 by meena.p

1 answer

A paisa coin is made up of Al-my alloy and weights $0.75\;g$ It has a square shape and its diagonal measures $17\;mm$ It is electrically neutral and contains equal amounts of positive and negative charges. Treating the paisa coins made up only $Al$ , find the magnitude of equal number of positive and negative charges. What conclusion do you draw from this magnitude ?

asked Apr 29, 2015 by meena.p

1 answer

The dimensions of an atom of the order of an angstrom. Thus there must be large electric fields between the protons and electron . Why then is the electrostatic field inside a conductor zero?

asked Apr 29, 2015 by meena.p

1 answer

An arbitrary surface enclosed a dipole . what is the electric flux through this surface ?

asked Apr 29, 2015 by meena.p

1 answer

Suppose the particle in $Q_{33}$ is an electron projected with velocity $V_x =2.0 \times 10^6 m/s$ . If E between the plates separated by $0.5 \;cm$ is $9.1 \times 10^2 N/C$ , where will the electron strike the upper plate ? $(|e|=1.6 \times 10^{-19}\;C,m_e=9.1 \times 10^{-3}\;kg)$

asked Apr 29, 2015 by meena.p

1 answer

A particular of mass m and charge $(-q)$ enters the region between the two charged plates initially moving along x-axis with speed $V_x$ (like particle 1 in the figure) . The length of plate of L and a uniform electricity field E is maintained between the plates. she that the vertical deflection of the particle at the fan edge of the plate is 4qEl^2/2mv_x ^2$. Compare this motion with motion of a projectile in gravitational field.

asked Apr 29, 2015 by meena.p

1 answer

Verify this result for the simple configuration of two charge of the same magnitude and sign placed at a certain distance apart.

asked Apr 29, 2015 by meena.p

1 answer

Consider an arbitrary electrostatic field configuration . A small test charge is placed at a null point . ( i.e where $E=0$ )of the configuration . Show that the equilibrium of the test charge is necessarily unstable .

asked Apr 29, 2015 by meena.p

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It is believed that protons and neutrons (which constitute nucli of or ordinary matter) are themseleves built out of more elementary units called quarks. A proton and a neutron consists of there quarks each. Two type of quarks, the so called 'up' quark (denoted by u) of charge $+\bigg( \large\frac{2}{3}$ $e\bigg)$ and the down quark denoted by of charge $\bigg( \large\frac{-1}{3}$ $e\bigg)$ , together with electricity build up an ordinary matter. (quarks of other types have also been found which give rise to different ususual varieties of matter. ). Suggest a possible quark composition of a proton and neutron .

asked Apr 29, 2015 by meena.p

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A sensitive instrument is to shielded from the story electrostatic field in its environment . Suggest a possible way

asked Apr 28, 2015 by meena.p

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Another conductor B with charge q is inserted into the cavity keeping B insulted from A. Show that the total charge on the outside surface of A is $Q+q$ (fig b)

asked Apr 28, 2015 by meena.p

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In a certain region of space , electric field is along the z- direction throughout. The magnitude of electric field is, however not constant but increases uniformly along the positive z- direction, at the rate of $10^5 N/c-m$ . What are the force and torque experienced by a system having a total dipole moment equal to $10^{-7}c-m$ in the negative z- direction ?

asked Apr 28, 2015 by meena.p

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