Recent questions tagged ch1

How many electrons must be removed from a piece of metal to give it a positive charge of $\;1\times10^{-7} \;C\;?$

asked Jan 29, 2014 by yamini.v

1 answer

If $\ast$ is a binary operation on the set $(\{0, 1, 2, 3, 4, 5\})$ defined as \[ a \ast b = \left\{ \begin{array} {1 1} a+b, & \quad \text{ if a$+$b $<$ 6} \\ a+b-6, & \quad \text{ if a+b $\geq$ 6} \\ \end{array} \right. \] then draw the composition table for the operation and find the identity element and inverse of $4$ if exists.

asked Jan 27, 2014 by rvidyagovindarajan_1

1 answer

Given electric field $ \overrightarrow {E} =[1 \times (d + x) \hat i +E_0 \hat j ] N/c$. If a closed surface as shown below is considered , find the change enclosed.

asked Jan 15, 2014 by meena.p

1 answer

Two point particles of same mass M are attached to two ends of a massless non-conducting rigid rod of length l. The charge on particle are +q and -q. The rod is held in a region of uniform electric field E making an angle $\theta $( very small) with E. When rod is released , its angular frequency will be :

asked Jan 15, 2014 by meena.p

1 answer

Two point particles of same mass M are attached to two ends of a massless non-conducting rigid rod of length l. The charge on particle are +q and -q. The rod is held in a region of uniform electric field E making an angle $\theta $( very small) with E. Magnitude of torgue on rod will be equal to:

asked Jan 15, 2014 by meena.p

1 answer

Three infinite long plane sheets carrying charge densities $\sigma _1 =+3 \sigma , \sigma _2 =+2 \sigma $ and $\sigma _3 =- \sigma $ are placed parallel to $x-z$ plane at $y=4a,y=3a$ and $y=a $ respectively. Electric field at point P is :

asked Jan 15, 2014 by meena.p

1 answer

If electron of mass $m_e$ moves through a certain distance in a uniform electric field in time $t_1$ and proton of mass $m_p$ moves same distance in time $t_2$ , the ratio $\large\frac{t_1}{t_2}$ will be :

asked Jan 15, 2014 by meena.p

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Two thin rings of radius R are placed at a distance a between them such that their axes coincide. Potential difference between the centre of the ring will be , if charges on rings are $+q $ and $-q$

asked Jan 13, 2014 by meena.p

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A spherical shell of radius R has a charge Q uniformly distributed on its surface. What is the force exerted by one half over the other.

asked Jan 13, 2014 by meena.p

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Find electric field at point $(a,a,a) $ due to three infinitely long lines of charge density $\lambda$ along $x,y $ and $ z$ axis

asked Jan 13, 2014 by meena.p

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Three identical spheres , each having a charge q and radius R are kept in such a way that each touches the other two. Find magnitude of electric force on any sphere due to other two sphere,

asked Jan 13, 2014 by meena.p

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What will be the electric field at point P. Assume (r >> a)

asked Jan 13, 2014 by meena.p

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A point charge Q is placed at the centre of an imaginary Gaussian surface. Find flux through curved surface.

asked Jan 13, 2014 by meena.p

1 answer

Electric field intensity due to a semi- infinite wire at a point A as shown is :

asked Jan 13, 2014 by meena.p

1 answer

A charged particle moves in a circle around an infinite line charge such that center of circle lies on line and line is perpendicular to plane of circle. If r is the radius of circle the velocity of particle will depend on which power of r .

asked Jan 10, 2014 by meena.p

1 answer

A conducting spherical shell is earthed. A +ve charge $+q_1$ is placed at its centre and another +ve charge $+q_2$ is placed outside at a distance d from centre . If the conducting spherical shell is not earthed , then force on $q_2$ is:

asked Jan 10, 2014 by meena.p

1 answer

A conducting spherical shell is earthed. A +ve charge $+q_1$ is placed at its centre and another +ve charge $+q_2$ is placed outside at a distance d from centre . If the effect of induced charge due to $q_2$ on sphere is ignored. Then coulomb force on $q_2$

asked Jan 10, 2014 by meena.p

1 answer

A charge particle of mass 1 kg and charge $ 1 \mu c$ is projected from horizontal ground at an angle $ \theta=45^{\circ}$ with speed $10 ms^{-1}$. In space a horizontal electric field towards the direction of projection $E= 10^{7}NC^{-1}$ exists. The range of projectile is :

asked Jan 10, 2014 by meena.p

1 answer

A charge Q is placed at a distance $D( > R)$ above the centre of disk of radius R The magnitude of flux through disk is $\phi$ . Now a hemispherical shell of radius R is put above the disk to form a closed surface. The flux through the closed surface, if direction of area vector along outward normal is +ve, is :

asked Jan 10, 2014 by meena.p

1 answer

Two infinite long parallel wires having linear charge densities $\lambda_1\; and\; \lambda_2 $ respectively are placed at a distance R. The force per unit length on wire (1) will be:

asked Jan 10, 2014 by meena.p

1 answer

If a point charge is placed at the centre of closed cylindrical conductor of length l and radius R. the flux through the cylinder will be :

asked Jan 9, 2014 by meena.p

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A circular ring of radius R has charge Q distributed uniformly on it. If a space of radius R, has its centre lying on boundary of the ring, then flux coming out of sphere will be :

asked Jan 9, 2014 by meena.p

1 answer

An infinite long semicircular tube is given as shown below one half is given a surface charge density $+\sigma$ and other half is given charge density $-,\sigma $ . Electric field at a point on axis would be

asked Jan 9, 2014 by meena.p

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Mark the correct statements :

asked Jan 9, 2014 by meena.p

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The correct statement for the phenomenon of "Electrostatic Induction " is :

asked Jan 9, 2014 by meena.p

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Charge Q is given displacement $ \overrightarrow {r} = a\hat i + b \hat j $ in electric field $\overrightarrow {E}= E_1 \hat i +E_2 \hat j . $ work done is :

asked Jan 8, 2014 by meena.p

1 answer

In one gram solid, there are $10^{22}$ atoms. If one electron is removed from each one of $0.01 \%$ of atoms the charge gained by solid would be :

asked Jan 8, 2014 by meena.p

1 answer

A conductor having a cavity is given a positive charge. What are field strengths $E_A,E_B$ and $E_C$ at point A (inside the cavity), B (with in conductor but outside cavity ) and C (outside the conductor ) respectively ?

asked Jan 8, 2014 by meena.p

1 answer

Choose the correct option : If the point charge is located inside a spherical gaussian surface away from its centre.

asked Jan 8, 2014 by meena.p

1 answer

A charge q is placed at centre of cube of side l. The electric flux through one face of cube will be :

asked Jan 8, 2014 by meena.p

1 answer

If $E_e$ be the electric field strength of a short dipole at a point on the equitorial line and $ E_a$ be that on axial line at same distance then :

asked Jan 6, 2014 by meena.p

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16 dipoles of charge of magnitude e are placed inside a cube. The total electric flux coming out of the cube will be :

asked Jan 6, 2014 by meena.p

1 answer

Two equal and opposite charges $ 8 \times 10^{-8} C$ are placed $ 2 \times 10^{-2} $ cm away from a dipole . If this dipole is placed in an external electric field $2 \times 10^8 N/C$. the value of maximum torque and work done in rotating through $180^{\circ}$ will be :

asked Jan 6, 2014 by meena.p

1 answer

Region surrounding electric dipole

asked Jan 6, 2014 by meena.p

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Regarding Linnaeus' time : 1. a Two Kingdom system of classification with Plantae and Animalia kingdoms was developed. 2. This system is still used till 3. This system did not distinguish between the eukaryotes and prokaryotes, & photosynthetic (green algae) and non-photosynthetic (fungi) organisms; yet this system distinguishes unicellular and multicellular organisms

asked Jan 6, 2014 by pady_1

1 answer

Regarding Aristotle: 1. used floral characters to classify plants 2. divided animals into two groups, those which had red blood and those that did not 3. a Two Kingdom system of classification with Plantae and Animalia kingdoms 4. earliest to attempt to classify organisms more on a scientific basis 5. classified plants into trees, shrubs and herbs

asked Jan 6, 2014 by pady_1

1 answer

The herbarium sheets carry a label providing information about (i)date of collection (ii)place of collection (iii)botanical names, family names (iv)English, local names (v)collector’s name

asked Jan 6, 2014 by pady_1

1 answer

1.As one goes higher from species to kingdom, the number of common characteristics goes on increasing. 2. Lower the taxa, more are the characteristics that the members within the taxon share. 3.Higher the category, determining the relationship to other taxa at the same level becomes easy.

asked Jan 6, 2014 by pady_1

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1. Families are characterised only on the basis of reproductive features of plant species 2. Lion, tiger, leopard is put along with cats and dogs in the family Felidae 3. Three different genera Solanum, Petunia and Datura are placed in the family Solanaceae

asked Jan 6, 2014 by pady_1

1 answer

1. The scientific names need not always ensure that each organism has only one name. 2. Description of any organism should enable the people (in any part of the world) to arrive at the same name. 3. While naming a new organism suh a name may have been used for some other closely related known organism.

asked Jan 6, 2014 by pady_1

1 answer

A change A is divided into two parts: q and Q-q. if Coulomb repulsion between them when they are separated is maximum , $\large\frac{Q}{Q-q}$ should be :

asked Jan 3, 2014 by meena.p

1 answer

By R.H. Whittaker's Five Kingdom Classification Assertion (A) : Kingdom Protista has brought together Chlamydomonas, Chlorella (earlier placed in Algae within Plants and both having cell walls) with Paramoecium and Amoeba (which were earlier placed in the animal kingdom which lack cell wall). Reason (R) : It has put together organisms which, in earlier classifications, were placed in different kingdoms. Regarding (A) and (R)

asked Jan 3, 2014 by pady_1

1 answer

Which of the following is more general in characters as compared to class

asked Jan 3, 2014 by pady_1

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Which of the following is less general in characters as compared to genus

asked Jan 3, 2014 by pady_1

1 answer

Assertion (A) : Monera and Protista both are of cellular in body organisation; Monera is Eukaryotic and Protista is Prokaryotic Reason (R) : Eukaryotic organisms have nuclear membrane and Prokaryotic organisms do not have nuclear membrane Regarding (A) and (R)

asked Jan 3, 2014 by pady_1

1 answer

The taxonomic studies of various species of plants and animals are useful in:

asked Jan 3, 2014 by pady_1

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Regarding Keys choose the incorrect one:

asked Jan 3, 2014 by pady_1

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Regarding 1 and 2 <br> 1. The keys are based on the contrasting characters generally in a pair called compliment. <br> 2. Each statement in the key is called a cue.

asked Jan 3, 2014 by pady_1

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Regarding 1 and 2 1. The keys are based on the contrasting characters generally in a pair called compliment. 2. Each statement in the key is called a lead.

asked Jan 3, 2014 by pady_1

1 answer

Zoological Parks are the places:

asked Jan 3, 2014 by pady_1

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