Recent questions tagged ch-1

The crystalline structure of $Nacl$ is

asked Sep 3, 2015 by meena.p

1 answer

The coordination number of a metal crystallizing in a hexagonal close packed (hcp) structure is

asked Sep 3, 2015 by meena.p

1 answer

Close packing is maximum in the crystal lattice of

asked Sep 3, 2015 by meena.p

1 answer

Which of the following statements is incorrect about amorphous solids ?

asked Sep 3, 2015 by meena.p

1 answer

In calcium fluoride structure , the coordination number of calcium and fluoride ions are :

asked Sep 1, 2015 by meena.p

1 answer

The closest packing sequence ABAB ..... represents

asked Sep 1, 2015 by meena.p

1 answer

Germanium or silicon becomes semiconductor due to

asked Sep 1, 2015 by meena.p

3 answers

The coordinate number for an atom in a primitive cubic unit cell is

asked Sep 1, 2015 by meena.p

1 answer

For tetrahedral coordination number the radius ratio $r_i^+/r_a^-$ is

asked Sep 1, 2015 by meena.p

1 answer

In a closed packed array of N spheres the number of tetrahedral holes is

asked Sep 1, 2015 by meena.p

1 answer

Bragg's law is given by the equation

asked Sep 1, 2015 by meena.p

1 answer

A match box exhibits

asked Sep 1, 2015 by meena.p

1 answer

Which one is not the property of crystalline solid ?

asked Sep 1, 2015 by meena.p

1 answer

Name one soild in which both frenkel and schootty defect occur.

asked Sep 1, 2015 by meena.p

1 answer

Which point defect lowers the density of a crysal ?

asked Sep 1, 2015 by meena.p

1 answer

How can a material be made amorphous ?

asked Sep 1, 2015 by meena.p

1 answer

What type of defect can arise when a solid is heated .

asked Sep 1, 2015 by meena.p

1 answer

Which of the following lattices has the highest packing efficiency .

asked Sep 1, 2015 by meena.p

1 answer

What is the two dimensional coordination number of a molecule in square close packed layer ?

asked Sep 1, 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

1 answer

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

1 answer

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

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

asked Apr 29, 2015 by meena.p

0 answers

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

1 answer

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

1 answer

A hollow charged conductor has a tiny hole cut into its surface . show that the electric field in the hole is $ \bigg( \large\frac{\sigma}{2 \in_0}\bigg)$$\hat n$, where $\hat n$ is the unit vector in the outward normal direction and $\sigma$ is the surface change density near the hole.

asked Apr 28, 2015 by meena.p

1 answer

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

1 answer

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

1 answer

A conductor A with a cavity as shown in the fig(a) is given a charge Q. Show that the entire charge must appear on the outer surface of the conductor .

asked Apr 28, 2015 by meena.p

1 answer

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

1 answer

Ask Questions, Get Answers